Source: 6 suspects behind Kenya's Westgate mall attack, including woman
October 7, 2013 -- Updated 0953 GMT (1753 HKT)
Smoke rises from the Westgate mall in Nairobi on September 23, 2013.
- The six include four men who died in the mall and have been identified
- Official: A female attacker, found dead with a gun, is believed to have killed 30 people
- Another attacker changed clothes and left the mall with the crowds, the official says
Nairobi, Kenya (CNN) -- At least six people have been singled out for their involvement in last month's Westgate mall attack --and that number is expected to double once the investigation is complete, a senior Kenyan government official said.
The official declined to be identified due to the sensitivity of the information.
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Previously, a spokesman for the Kenya Defense Forces identified four terrorists who took part in the mall attack, which left at least 67 people dead. Those four are Khattab al-Kene, an American Somali; Abu Baara al-Sudani, from Sudan; Omar Nabhan, from Kenya; and a man identified only as Umayr.
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Kenya's Counter-Terrorism Office said Nabhan was related to former senior al Qaeda in Somalia operative Saleh Ali Nabhan, who was killed in a U.S. strike in southern Somalia in 2009. Both men were from Mombasa, Kenya.
The four died when the part of the mall they were in collapsed, Maj. Emmanuel Chirchir said. The charred bodies of the four are undergoing DNA verification.
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Other suspected attackers either seen in security footage or described by eye-witnesses are not yet counted because their bodies have either not yet been positively identified, or their whereabouts are unknown.
The senior government official said in addition to the four men who have been identified, there was also a woman identified as Somali whose body was found with a mounted gun. The official said the woman is responsible for single-handedly killing more than 30 people.
The official said a sixth attacker changed clothes and left the mall with other hostages.
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In short, five attackers are dead, and one escaped, according to the official.
Separately, security footage newly released by Kenyan police shows two men withdrawing money at a Barclays bank in Nairobi, and police believe they are connected to the terror attack.
These men are at large, and police say there is a bounty on their heads. It was unclear if either of the two men could be the same as the attacker who fled the mall.
CNN's Christabelle Fombu contributed to this report.
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Kenya mall attack
October 17, 2013 -- Updated 1355 GMT (2155 HKT)
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October 22, 2013 -- Updated 1132 GMT (1932 HKT)
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October 10, 2013 -- Updated 1908 GMT (0308 HKT)
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September 27, 2013 -- Updated 1940 GMT (0340 HKT)
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September 26, 2013 -- Updated 2045 GMT (0445 HKT)
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September 29, 2013 -- Updated 1701 GMT (0101 HKT)
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September 24, 2013 -- Updated 2058 GMT (0458 HKT)
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September 28, 2013 -- Updated 1336 GMT (2136 HKT)
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September 27, 2013 -- Updated 2128 GMT (0528 HKT)
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September 25, 2013 -- Updated 0242 GMT (1042 HKT)
Photos from the attack as it happened.
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)
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September 27, 2013 -- Updated 0125 GMT (0925 HKT)
The Westgate mall's parking deck collapsed leaving a crater full of destroyed and burned cars in Narobi, Kenya.
September 24, 2013 -- Updated 1138 GMT (1938 HKT)
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September 23, 2013 -- Updated 1440 GMT (2240 HKT)
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September 2, 2014 -- Updated 1359 GMT (2159 HKT)
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September 24, 2013 -- Updated 2115 GMT (0515 HKT)
What the mall looked like before the attack.