Somalia's Al-Shabab Islamist group said on Tuesday its militants were still holed up in a Kenyan shopping mall they attacked at the weekend and there were "countless dead bodies", raising fears the death toll could be higher than 62.
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Kenyan security forces were searching for the Al-Qaida-linked attackers who are believed by Western sources to include Americans and possibly a British woman who may be the widow of a suicide bomber who took part in an attack in London in 2005. Al Shabaab rejected suggestions that foreigners were involved.
Sporadic bursts of gunfire and an explosion marked the fourth day since the militants stormed into the Westgate centre in Nairobi during a busy Saturday lunchtime, spraying bullets and lobbing grenades.
Helicopters buzzed over the complex, which is popular with foreigners and prosperous Kenyans. Al Shabaab says it launched the attack in pursuit of demands that Kenya withdraw troops from Somalia, where they have battled the Islamist group. President Uhuru Kenyatta has vowed to stay the course there.
The attack has come at a time when several violent Islamist groups from Mali to Algeria, Nigeria to Kenya - tapping into local grievances but all espousing an anti-Western, anti-Christian creed - are striking at state authority and international interests.
"There are still gunmen in the building," said an intelligence officer, who asked not to be named, speaking near the mall, which is surrounded by troops. Asked if there were still hostages, he said: "We are not sure yet."
As Kenyan authorities asserted that the end of the siege was "very near," Al-Shabab said its militants were still holding out in the Westgate centre and their hostages were still alive.
"There are countless number of dead bodies still scattered inside the mall, and the Mujahideen (fighters) are still holding their ground #Westgate," the group said on its Twitter feed @HSM_PR. "The hostages who were being held by the Mujahideen inside #Westgate are still alive, looking quite disconcerted but, nevertheless, alive."
It described its fighters as "unruffled and strolling around the mall in such sangfroid manner."
People who earlier helped remove bodies from the mall said they believed there were still many lying there yet to be removed, suggesting that the death toll could rise.
The Kenyan military said its forces were carrying out "mop up operations" in the building.
The Interior Ministry earlier said security forces were in control of the mall and that all the hostages had been released.
A trickle of survivors left on Monday, but the fate of those still missing was unclear. It was also unclear how many of the militants had been killed or captured.
The government said on Monday three had died and a television report on Tuesday said "six of the remaining attackers" were killed. There has been no clear official tally.
An army spokesman said 11 soldiers had been admitted to hospital, and of that number three had died.
Images from closed-circuit television inside the mall during the attack, published in a Kenyan newspaper on Tuesday, showed two militants, casually dressed and wearing ammunition belts. One held an assault rifle. Al Shabaab confirmed that the two men were part of the group that attacked Westgate.
Kenyan Foreign Minister Amina Mohamed told the U.S. PBS Newshour television show that "two or three Americans" and a British woman were among the militants.
She said the Americans were "young men, about between maybe 18 and 19" years old. She said they were of Somali or Arab origin and had lived in "in Minnesota and one other place".
Al-Shabab, which said it had been in communication with its members in the mall, dismissed the minister's comments.
"Those who describe the attackers as Americans and British are people who do not know what is going on in Westgate building," Al-Shabab's media office told Reuters.
A British security source said it was possible that Samantha Lewthwaite, the widow of Germaine Lindsay, one of the suicide bombers who killed more than 50 people on London's transport system in 2005, was involved in the Nairobi siege.
When asked about reports that Lewthwaite, dubbed the "white widow" by the British media, was directly involved in the attack in Kenya, the source said: "It is a possibility. But nothing definitive or conclusive yet."
Lewthwaite is thought to have left Britain several years ago and is wanted in connection with an alleged plot to attack hotels and restaurants in Kenya.
U.S. security sources said they were looking into information from Kenya that residents of Western countries, including the United States, may have been among the militants.
U.S. President Barack Obama, whose father was born in the east African nation, offered help, saying he believed Kenya - the scene of one of Al-Qaida's first major attacks, in 1998, and a neighbour of chaotic Somalia - would continue to be a regional pillar of stability.
Kenyan officials have tried to reassure the country that they are in command of the situation. Officials said there would be a news briefing on the situation later on Tuesday.
"We continue to appeal for calm, keep vigil and avoid Westgate area," the Ministry of Interior said on its Twitter account.
The attack on the mall is the worst such incident in Kenya since Al-Qaida killed more than 200 people when it bombed the U.S. Embassy in Nairobi in 1998.
When fighters from its Somali ideological counterpart stormed the mall on Saturday, they hit a high-profile symbol of Kenya's economic power.
Kenya has sent troops to Somalia as part of an African Union force trying to stabilise the country, which was long without a functioning government, and push back Al-Shabab.
It has also suffered internal instability. President Kenyatta, who lost a nephew in the weekend bloodbath, faces charges of crimes against humanity at the International Criminal Court for his alleged role in coordinating violence after disputed elections in 2007. He denies the charges.
British Defense Secretary Philip Hammond said he believed six Britons had died in the attack. Other known foreign victims are from China, Ghana, France, the Netherlands and Canada. Kenyan officials said the total death toll was at least 62.
Conflicting comments have fuelled speculation about the attackers' identity. While the foreign minister said there was a woman attacker killed, Interior Minister Joseph Ole Lenku had said on Monday they were all men but some had dressed as women.
'Israel empathizes with the Kenyan people's pain'
Prime Minister Benjamin Netanyahu spoke with Kenyan President Uhuru Kenyatta on the telephone Monday and conveyed his condolences for the attack.
"Israel empathizes with the Kenyan people's pain," Netanyahu told Kenyatta, "and with your own personal loss due to the terror attack. We value your nation's determined struggle against terrorism."
Israel, whose citizens own stores in the Israeli-built mall and have been targeted by Islamists in Kenya before, said Israeli experts were also helping.
UN envoy to Somalia urges fight against Al Shabab
The United Nations envoy for Somalia, meanwhile, called on Tuesday for additional African troops to counter al Shabaab, which he said numbered some 5,000 people and posed an international threat.
Nicholas Kay, UN special representative for Somalia, condemned the deadly attack on the mall, which the Islamist militant group has claimed responsibility for, and said that there was a "once-in-a-generation" opportunity to help bring peace to Somalia.
"Security remains the number one challenge, the control and defeating of al Shabaab is key to this," Kay told a Geneva news briefing. "The amount of money that we're talking about that's required for the extra effort in Somalia would be very small. But the cost of walking away would be very expensive."