Rescuers wore face masks and some soldiers wrapped scarves around their mouths to cover what they said was an overpowering stench inside the Westgate centre, once one of the capital's most upmarket malls. A large part of the centre has collapsed after heavy explosions and a fierce fire.
President Uhuru Kenyatta announced an end to the 80-hour bloodbath late yesterday, with the "immense" loss of 61 civilians and six members of the security forces. Police said the death toll was provisional, with the Kenyan Red Cross listing 63 people as still missing.
"Leading forensic experts" from other countries including America, Britain and Israel are supporting Kenyan teams, civil service chief Francis Kimemia said.
An AFP reporter outside the bullet-riddled Westgate mall also saw teams of sniffer dogs, which will check for explosives and victims buried under the rubble of a collapsed part of the building.
"They are checking for any potential explosive devices left behind," a security source said, adding that specialist remote-controlled demining robots were on hand.
In one of the worst attacks in Kenya's history, the militants marched into the four-storey, part Israeli-owned mall at midday Saturday, spraying shoppers with automatic weapons fire and tossing grenades.
Close to 200 were wounded in the four-day siege, which saw running battles between militants and security forces in the complex, Nairobi's largest shopping centre and popular with wealthy Kenyans, diplomats, UN workers and other expatriates.
As well as scores of Kenyans -- from ordinary workers to the president's nephew -- many of the dead were foreigners, including six Britons, two Canadians, a Chinese woman, a Dutch woman, two French women, two Indians, a South African and a South Korean.