Kenyan authorities have claimed "full control" of the Westgate Mall in Nairobi as they sweep the shopping center for any remaining terrorists, hostages still in hiding and dead bodies four days after an al Qaeda-linked rebel group launched an attack that left at least 62 people dead and 175 injured.
"The West Gate Mall is under the full control of gov't forces and we are carrying out a sweep to ensure its safe for everyone," Kenyan police tweeted today on their official Twitter account.
Kenya's Foreign Minister told PBS Monday night that "two or three Americans" were involved in the attack on the upscale mall. Speaking in New York, Amina Mohamed said a British woman was also among the perpetrators.
She's the first official to publicly allege that U.S. nationals were involved in the attack. The FBI says it has been unable to verify that, and other Kenyan officials have said no women were involved, only men dressed as women.
Sporadic gunfire and explosions could be heard earlier this morning coming from the mall after Kenyan authorities said Monday they killed three suspected terrorists and arrested at least 10 others.
Kenyan police said the explosions resulted from their "doing clean-up of explosives that had been set up by the terrorists."
A Twitter account claiming to be the terrorist group al-Shabab, which has claimed responsibility for the attack, has tweeted that militants are still holding hostages alive inside and that its fighters are "still holding their ground."
Either way, Kenya's Ministry of the Interior tweeted earlier today, "Westgate remains a crime scene, keep off the area. Roads leading to this mall have been cordoned off."
President Uhuru Kenyatta is scheduled address the nation later today to give an update on the situation that began Saturday, according to the Kenyan government.
Officials said Monday they had rescued most of the remaining hostages inside the mall as forces went floor to floor searching for suspected terrorists associated with al-Shabab, an Islamist terror organization based in Somalia.
Authorities said they killed three suspected terrorists and arrested at least 10 others who are being questioned by police.
"We have taken control of all the floors," Kenyan police said Monday via an official Twitter account. "We're not here to feed the attackers with pastries but to finish and punish.
Eleven soldiers were injured in the attack and are being treated for injuries, according to authorities.
At least 62 people have been killed since the attack began Saturday when 12 to 15 al-Shabab militants wielding grenades and guns stormed the upscale mall and began firing on civilians. Eyewitnesses say the militants were shooting anyone who couldn't prove they were Muslim.
Arnold Mwaghacho, who was working at a gourmet burger bar when terrorists began their attack, was wounded in the attack and played dead so the militants would walk by his body.
"I took the blood that I was covered with. I rubbed it on my face so when they came there they think I'm dead," he said.
Among the dead are Australian architect Ross Langdon and his girlfriend, Elif Yavuz, a Harvard graduate who worked for The Clinton Foundation. Yavuz was eight months pregnant and was working with President Bill Clinton's foundation to fight the spread of malaria and AIDS in Africa.
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.
President Kenyatta's nephew and the man's fiancée were also killed in the siege.
Al-Shabab, which means "The Youth" in Arabic, said the mall attack was in retribution for Kenyan forces' 2011 push into neighboring Somalia. In response, the group has increasingly set its sights on soft targets like the Westgate Mall.
The attack on the mall was the deadliest terrorist attack in Kenya since the 1998 al Qaeda truck bombing of the U.S. Embassy in Nairobi, which killed more than 200 people.
Al-Shabab has been among the most effective terror groups in attracting Americans to their cause, often of Somali descent, experts say.
"If you think about individuals who went and fought in a place like Somalia, and when they come back home there's nothing good that can come of this," terrorism expert Ali Soufain said. "And what we see today in Somalia, it can be easily copied. What we see today in Somalia can be easily copied by people inside the United States."
U.S. officials estimate that as many as 50 Americans have been recruited to al- Shabab in the past six years, with more than half traced back to Minnesota's growing Somali community.
ABC News' Russell Goldman, Kirit Radia and The Associated Press contributed to this report.