NAIROBI, Kenya (AP) -- Kenyan President Uhuru Kenyatta says security forces have finally defeated a small group of terrorists after four days in fighting at a Nairobi mall.
In a televised address to the nation Tuesday, Kenyatta said "we have ashamed and defeated our attackers."
He said the attack had left 240 casualties, including 61 dead civilians and six of his security forces. He said five terrorists were killed and another 11 suspects have been taken into custody.
The president says three floors of the Westgate mall collapsed and that there are "several bodies still trapped in the rubble including the terrorists."
He declared three days of national mourning.
THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.
Islamic militants who staged a deadly attack on a Kenya mall said Tuesday hostages are alive and their fighters are "still holding their ground," calling into question Kenyan officials' claims that they were in a final push.
Explosions rang from the upscale Westgate Mall in Nairobi throughout the day, and the chatter of gunfire from inside the building could also be heard, despite the Kenyan government assurances of success. Fresh smoke also rose in the afternoon.
As the fighting went on for a fourth day, Nairobi's city morgue braced for the arrival of a large number of bodies of people killed, an official said.
Earlier, the Kenyan Red Cross confirmed at least 62 people had been killed, but spokesman Abbas Gullet said it was still not known how many more may be dead inside the building.
"It is certainly known that there are more casualties," he said.
A government official told The Associated Press that the morgue was preparing for up to an additional 60 bodies, though the official didn't know an exact count. The government official insisted on anonymity so he would not face retribution from government officials.
Three Kenyan soldiers have been killed and eight others injured, the Kenyan Interior Ministry said Tuesday.
A soldier emerging from the mall told the AP "we are finished," but then conceded that government forces were still trying to secure the entire interior.
He said troops were checking for explosives, and to see if they could find any survivors in certain areas including the mall's movie theater and casino. He spoke on condition of anonymity because he said he was under orders not to speak to media.
The al-Qaida-linked attackers gave a conflicting account of the mall conflict, using social media.
"There are countless number of dead bodies still scattered inside the mall, and the mujahideen are still holding their ground," said the Somali rebel group al-Shabab in a Twitter message considered to be genuine.
It added that the hostages are "still alive looking quite disconcerted but, nevertheless, alive."
But Kenyan police urged people to ignore "enemy... propaganda" and assured that the defense forces were continuing to "neutralize" the terrorist threat.
"Troops now in mop up operations in the building, " the police said on Twitter.
A U.S. Embassy vehicle, identifiable by its numbered diplomatic license plate, arrived at the morgue on Tuesday. American officials have not confirmed the deaths of any U.S. citizens in the mall attack, but it appeared possible the Americans who visited the morgue - likely security officials with an agency like the FBI - could have been seeking information about one of the bodies inside.
Al-Shabab, whose name means "The Youth" in Arabic, said the mall attack was in retribution for Kenyan forces' 2011 push into neighboring Somalia. African Union forces pushed the al-Qaida-affiliated group out of Somalia's capital in 2011.
"You could have avoided all this and lived your lives with relative safety," the group Tweeted Tuesday. "Remove your forces from our country and peace will come."
While the government announced Sunday that "most" hostages had been released, a security expert with contacts inside the mall said at least 10 were still being held by a band of attackers described as "a multinational collection from all over the world."
Kenyan Foreign Minister Amina Mohamed said "two or three Americans" and "one Brit" were among those who attacked the mall.
She said in an interview with the PBS "NewsHour" program that the Americans were 18 to 19 years old, of Somali or Arab origin and lived "in Minnesota and one other place" in the U.S. The attacker from Britain was a woman who has "done this many times before," Mohamed said.
U.S. officials said they were looking into whether any Americans were involved. State Department spokeswoman Jen Psaki said Monday that the department had "no definitive evidence of the nationalities or the identities" of the attackers.
Britain's foreign office said it was aware of the foreign minister's remarks, but would not confirm if a British woman was involved.
But al-Shabab, responding to a request from AP, denied that any women had attacked the mall.
"We have an adequate number of young men who fully committed and ready to sacrifice their lives for the sake of Allah and for the sake of their religion, so there is no need for us to employ our sisters in the battlefield and thereby expose them to unnecessary risk. So these are just baseless rumours that have no substance," said the al-Shabab press office in what is thought to be an authentic email address.
Three attackers were killed in the fighting Monday, Kenyan authorities said, and more than 10 suspects arrested.
Al-Shabab spokesman Sheik Ali Mohamud Rage said in an audio recording posted on a militant website that the attackers had been ordered to "take punitive action against the hostages" if force was used to try to rescue them.
A Western security official in Nairobi who insisted on not being named to share information about the rescue operation said the only reason the siege hadn't yet ended would be because hostages were still inside.
Westgate mall, a vast complex with multiple banks that have secure vaults and bulletproof glass partitions, as well as a casino, is difficult to completely secure, the official said. "They are not made for storming," he said of the labyrinth of shops, restaurants and offices. "They're made to be unstormable."
The attack began on Saturday when some 12 to 15 al-Shabab militants invaded the mall, wielding grenades and firing on civilians inside the complex, which includes shops for Nike, Adidas and Bose and is popular with foreigners and wealthy Kenyans.
The militants specifically targeted non-Muslims, and at least 18 foreigners were among the dead, including six Britons, as well as citizens from France, Canada, the Netherlands, Australia, Peru, India, Ghana, South Africa and China. Nearly 200 people were wounded, including five Americans.
The attack at the Westgate mall in Nairobi's Westlands neighborhood was the deadliest terrorist attack in Kenya since the 1998 al-Qaida truck bombing of the U.S. Embassy in Nairobi, which killed more than 200 people.
Associated Press reporters Jason Straziuso, Rodney Muhumuza, Ben Curtis, David Rising, Adam Schreck and Jacob Kushner in Nairobi, Kenya, Cassandra Vinograd in London, and Abdi Guled in Mogadishu, Somalia, contributed to this report.
David Rising, AP