Michael Brown’s stepfather is being investigated for inciting illegal activity during protests in Ferguson.
Video of Louis Head shows him yelling: “Burn this [place] down!” before last week’s riots over perceived racial injustice in the Missouri town.
Louis Head spoke as a grand jury announced no charges for a white police officer who shot and killed the unarmed teenager.
The incident sparked a nationwide dialogue about race relations.
St Louis County Police spokesman Brian Schellman told reporters on December 2 that authorities want to talk to Louis Head about his comments amid a larger investigation into arson and looting during the Ferguson protests.
Twelve commercial buildings were destroyed by fire that night, after the jury’s decision was announced.
Family attorney Benjamin Crump has called Louis Head’s recorded comments “raw emotion”.
The officer who shot 18-year-old Michael Brown in Ferguson, Darren Wilson, resigned from the force over the weekend.
The policeman said he had feared for his life, but Michael Brown’s supporters said the teenager was attempting to surrender when he was shot.
The investigation into Louis Head comes one day after President Barack Obama requested $263 million to improve police training, pay for body cameras and restore trust in policing.
Ferguson protesters began targeting Black Friday sales at major retailers overnight in a new tactic to vent their anger at a grand jury decision not to indict a white Officer Darren Wilson who fatally shot black teenager Michael Brown.
About 75 demonstrators protested peacefully, chanting “Hands up, don’t shoot!”, bemusing bargain-hunters pushing their brimming shopping carts inside a Walmart in another nearby suburb of St. Louis.
They dispersed peacefully when ordered by a small group of police, moving on to a Target store where they staged a similar demonstration. More protests were planned for Friday.
Ferguson became a flashpoint for often troubled US race relations after Officer Darren Wilson shot dead Michael Brown on August 9.
The grand jury’s decision on November 24 not to charge Darren Wilson prompted a spasm of fury in Ferguson. About a dozen businesses were torched and more than 100 people were arrested in clashes with riot police that rumbled on into Tuesday night.
Before heading in convoy to Walmart late on Thursday, a group of some 100 demonstrators ate Thanksgiving dinner, sang, prayed and discussed their new strategy in the basement of a St. Louis church.
Ferguson, home to about 21,000 people, is a predominantly black city where almost all the political leaders and police are white.
Ferguson protests have spread across the US after the grand jury’s decision not to charge white policeman Darren Wilson who shot black teenager Michael Brown.
Demonstrations from New York to Seattle were mostly peaceful but rioting broke out in Oakland, California.
There was some unrest in Ferguson itself, with police making 44 arrests, but the town did not see rioting on the scale of Monday night.
Officer Darren Wilson says he has a “clean conscience”.
Darren Wilson, who shot 18-year-old Michael Brown on August 9, told ABC News that in the struggle which preceded the shooting, he had felt “like a five-year-old holding on to [US wrestler] Hulk Hogan”.
Many in Ferguson’s predominantly African-American community had called for Darren Wilson to be charged with murder, but the grand jury’s decision means the police officer will not face state criminal charges over the shooting.
Lawyers for Michael Brown’s family denounced the grand jury’s decision as “unfair” while condemning the violence that followed the decision.
St Louis County police chief Jon Belmar said November 25 had been “generally a much better night” in Ferguson, a town of 21,000 people.
Tear gas was fired just once, he said, when rioters smashed windows at the Ferguson town hall. There was only one report of shooting, he added, when a car was set alight.
Some 2,200 National Guard soldiers were deployed to assist police in keeping order in and around the town.
Protests were reported in 12 cities: St Louis itself as well as Seattle, Albuquerque, New York, Cleveland, Los Angeles, Oakland, Minneapolis, Atlanta, Portland, Chicago and Boston.
In Oakland, in the San Francisco Bay area, rioters vandalized police cars and businesses in the centre during a second night of unrest in the port city of 406,000 people.
Looting was reported in several locations, including a classic car dealership and a mobile phone store, while a main road was briefly blocked, the US broadcaster CBS reports.
Speaking from Chicago on November 25, President Barack Obama said there was “no excuse” for destructive behavior and criminal acts of rioting, adding that those responsible should be prosecuted.
The frustration seen by the grand jury’s decision, the president said, had “deep roots in many communities of color who have a sense that our laws are not being enforced uniformly or fairly”.
Barack Obama said he had ordered Attorney General Eric Holder to look at what steps could be taken to build trust in communities and make sure that “law enforcement is fair”.
Much of the debate since August has centered on whether Michael Brown was attempting to surrender to Darren Wilson when he was shot.
Speaking to ABC News in his first public comments, Darren Wilson said there was nothing he could have done differently.
“The reason I have a clean conscience is because I know I did my job right,” he said.
Darren Wilson denied witness statements that Michael Brown had put his hands up, insisting race had played no part in the confrontation.
Ferguson police have stopped protesters angry over the shooting of Michael Brown last month from trying to block a nearby highway.
Police said 35 people were arrested as they tried to reach the Interstate 70 highway, but added that the protest was largely peaceful.
Many in Ferguson, Missouri, have demanded the arrest of white police officer Darren Wilson who shot 18-year-old Michael Brown on August 9.
Officer Darren Wilson has been on administrative leave since last month.
Police said 32 people were arrested on charges of unlawful assembly, with four people arrested on assault charges.
Organizers said the protest was specifically held in the same location as a similar demonstration in 1999.
On September 9, city leaders, mostly white, were heckled by the largely black crowd of residents at Ferguson’s first city council meeting since the shooting.
Ferguson police have stopped protesters angry over the shooting of Michael Brown last month from trying to block a nearby highway
“You’ve lost your authority to govern this community,” said St Louis activist John Chasnoff.
“You’re going to have to step aside peacefully if this community is going to heal.”
Many of the audience held up their hands in a gesture that has been used to protest at Michael Brown’s killing.
Michael Brown’s supporters say the teenager was trying to surrender when he was shot by Officer Darren Wilson after being stopped for walking in the middle of the street.
Ferguson, which has a population of 21,000, is a majority black city. Many residents questioned why the mayor, James Knowles, and five of the six city council members were white.
“I heard the mayor say Ferguson doesn’t have a race problem,” said resident Taurean Russell.
“There must be two Fergusons.”
Before the meeting, council officials announced proposals to reduce the revenue collected from court fines.
Critics have said this discriminates against low-income defendants who cannot afford private attorneys and who are often jailed for not paying the fines quickly enough.
However, the proposals were drowned out by anger from the audience who said nothing had changed since Michael Brown’s shooting.
There were demands for the arrest of Darren Wilson who is currently on administrative leave from the Ferguson Police Department while a grand jury determines whether charges should be filed against him.
Last week, the US Justice Department announced it was launching a broad investigation into whether there was racial discrimination in the department.
This is separate from a federal inquiry and the grand jury investigation into Michael Brown’s killing.
The National Guard has been sent to the town of Ferguson as protests escalate over the police shooting of black teenager Michael Brown.
Missouri Governor Jay Nixon signed an order to “help restore peace and order and to protect the citizens of Ferguson”.
The decision was made as police clashed with angry crowds shortly before a second night under curfew began.
Police in Ferguson, a suburb of St Louis, said they came under attack and had “no alternative” but to respond.
Captain Ron Johnson said protesters had thrown Molotov cocktails and bottles at security forces, and set up barricades before the five-hour curfew began at midnight on Sunday.
“For those who would claim that the curfew was what led to [the] violence, I will remind you this incident began three and a half hours before the curfew was to have started,” Ron Johnson told journalists in Ferguson on Monday.
Correspondents at the scene described seeing smoke clouds rise up as police began to disperse the protests on West Florissant Avenue, with a helicopter beaming down a spotlight.
Some of the demonstrators were spluttering and poured bottles of water into their eyes as they felt the effects of tear gas. Others sought cover from the unrest inside a fast food restaurant.
The killing of Michael Brown by a white policeman in a street on August 9 has inflamed racial tensions in the largely black suburb.
The National Guard has been sent to the town of Ferguson as protests escalate over the police shooting of black teenager Michael Brown (photo AP)
Officer Darren Wilson shot Michael Brown after reportedly stopping him for walking in the street, disrupting traffic.
Governor Jay Nixon has criticized police for releasing surveillance video which apparently shows Michael Brown stealing some hours before his death.
Jay Nixon said the release of the footage “appeared to cast aspersions” on the dead man, saying “it made emotions raw”.
He also condemned the protesters: “These violent acts are a disservice to the family of Michael Brown and his memory and to the people of this community who yearn for justice to be served and to feel safe in their own homes.”
A preliminary post-mortem examination by the St Louis County Medical Examiner’s office on the day after Michael Brown’s death found he had been shot, police said, without disclosing how many times.
However, a preliminary private post-mortem report has since revealed that he was shot at least six times, including twice in the head, the New York Times reports.
The bullets did not appear to have been fired from very close range due to the lack of gunpowder on the victim’s body, forensic pathologist Michael Baden was quoted by the paper as saying.
Michael Baden flew to Missouri on Sunday to conduct a separate autopsy at the request of the family.
Officials last week confirmed that Darren Wilson was a six-year police veteran with no previous complaints against him. He has been on paid administrative leave since the shooting.