5 suspects due to appear in Kenyan court over Westgate mall attack November 4, 2013 -- Updated 0736 GMT (1536 HKT) Kenya mall attack The suspects are expected to be charged in connection with the deadly attack Questions remain about the number of attackers involved in the siege At least 67 people were killed in the bloody four-day siege in September (CNN) -- Five people being held in connection with the terrorist attack on the Westgate mall in Kenya are expected to be charged in court Monday. The Somali terror group Al-Shabaab, an affiliate of al Qaeda, claimed responsibility for the bloody four-day siege at the upscale mall in Nairobi during which at least 67 people were killed. The attack began on September 21. Questions remain about the those who carried out the attack and the response by security forces. The exact number of people Kenyan authorities say were involved in or connected to the deadly assault has fluctuated. As the attack unfolded, Kenyan officials said that as many as 15 gunmen were involved. On the fourth day of the siege, as the security operation wound down, President Uhuru Kenyatta said five terrorists had been killed and 11 suspects were in custody. Last month, the Kenyan military said four gunmen died when part of the mall collapsed. It's unclear how many civilians and terrorists may still be buried beneath the concrete chunks of the collapsed section of the mall. The Norwegian security service, PST, has said it is investigating suspicions that a Norwegian citizen took part in the attack. Kenyan authorities say they are investigating allegations that some Kenyan soldiers looted stores in the mall as they searched for the attackers. Surveillance video from the mall showed gunmen casually shooting some civilians. They reportedly also tortured some hostages, according to military doctors who saw evidence of severed hands and noses. Some hostages had been hanged, according to the doctors. In recent weeks, U.S. Navy Seals sought but failed to capture Mohamed Abdikadir Mohamed, said to be one of the most dangerous Al-Shabaab commanders who is known as Ikrima. But a U.S. military drone strike in southern Somalia late last month killed two suspected Al-Shabaab members, U.S. officials said. One of those killed was described by one of the officials as Anta, considered a top technical and explosives expert for the group. October 17, 2013 -- Updated 1355 GMT (2155 HKT) As they strolled through the mall, guns strapped to their torsos, the attackers chatted on cell phones while they sprayed bullets at shoppers. October 22, 2013 -- Updated 1132 GMT (1932 HKT) A leaked video footage from inside has sparked anger amid claims that it shows soldiers looting from stores as they hunted for the gunmen. October 10, 2013 -- Updated 1908 GMT (0308 HKT) Elaine Dang pretended to be dead, and maybe because she did, she is alive to tell her story. She moved away from the crowd because she thought it would be most vulnerable. October 7, 2013 -- Updated 1029 GMT (1829 HKT) U.S. Navy SEALs entered the southern Somalia stronghold of Al-Shabaab, the group behind the Kenyan mall attack, in a mission targeting one of its leaders. September 27, 2013 -- Updated 1940 GMT (0340 HKT) Investigators have determined the attackers or their associates rented and operated a small store in the mall a year before the Kenya mall attack. September 29, 2013 -- Updated 1701 GMT (0101 HKT) Loved ones mourn the lives lost in the Westgate mall attack. Dozens of civilians and 6 security officers died in the four-day attack. September 24, 2013 -- Updated 2058 GMT (0458 HKT) The attack at Westgate mall lasted for four deadly days, with store-to-store siege. September 28, 2013 -- Updated 1336 GMT (2136 HKT) Twenty men are engaged in fiery debate on a sidewalk near Nairobi's Westgate mall, where terrorists stormed the shopping center and killed at least 67 people. September 27, 2013 -- Updated 2128 GMT (0528 HKT) It was the first major terrorist attack in history in which the group that mounted the operation used Twitter to announce to the world it was responsible. September 24, 2013 -- Updated 1753 GMT (0153 HKT) A safe distance from Nairobi's Westgate Mall, several Kenyans stare through a stand of trees at the site of one of the nation's worst terrorist attacks. September 26, 2013 -- Updated 1459 GMT (2259 HKT) British-born Samantha Lewthwaite was once seen as a kind of victim of the July 2005 London terror attacks -- the pregnant wife of one of the suicide bombers. September 26, 2013 -- Updated 0222 GMT (1022 HKT) Some answers may be revealed in blood-stained halls or deep in the rubble of Nairobi's Westgate Mall. Others may never be known. September 24, 2013 -- Updated 1138 GMT (1938 HKT) Of all al Qaeda's affiliated groups, the Somali terrorist organization Al-Shabaab has over the years had the deepest links to the U.S. September 23, 2013 -- Updated 1440 GMT (2240 HKT) It's hard to imagine a softer target than an enclosed, easy-to-enter space with large numbers of civilians milling about. September 23, 2013 -- Updated 1648 GMT (0048 HKT) Al-Shabaab, an al Qaeda-linked militant group based in Somalia, is believed to be responsible for the deaths of aid workers and peacekeepers