Kenyan security officials are to be questioned by MPs about alleged intelligence failings over the Nairobi’s Westgate shopping centre attack.
The head of the parliament’s defense committee says “people need to know the exact lapses in the security system”.
There are reports the National Intelligence Service (NIS) issued warnings a year ago.
Some 67 people were killed and many injured after al-Shabab militants stormed the Westgate centre in the capital Nairobi on September 21.
Five militants were killed by the security forces during the four-day siege and 10 people have since been arrested, the authorities say.
Al-Shabab, a Somali Islamist group, said the attack was in retaliation for Kenya’s military involvement in Somalia.
According to a BBC report, the militants hired a shop in Nairobi mall in the weeks leading up to the siege.
Security officials – including the head of the (NIS), Michael Gichangi – are set to appear before the parliamentary defense committee later on Monday.
Kenyan newspapers have reported that the NIS warned a year ago of the presence of suspected al-Shabab militants in the capital and that they were planning suicide attacks, including on the Westgate shopping centre.
Briefings were given to the ministers “informing them of increasing threat of terrorism and of plans to launch simultaneous attacks in Nairobi and Mombasa around September 13 and 20, 2013”, Kenya’s Daily Nation had quoted counter-terrorism reports as saying.
A dossier from the NIS – amounting to more than 8,000 pages according to Kenya’s Standard newspaper – also suggests the Israelis issued warnings that buildings owned by its citizens could be attacked between 4 and 28 September.
Westgate is partly Israeli-owned.
The Daily Nation has reported that Kenyan intelligence had established that al-Shabab leaders had begun singling out Westgate and the Holy Family Basilica for attack early this year.
Government figures said to have received the intelligence briefings include Interior Minister Joseph Ole Lenku, Treasury Minister Julius Rotich, Foreign Affairs Minister Amina Mohammed, Defence Minister Raychelle Omamo and Kenya Defence Forces chief Julius Karangi.