3:47 a.m.: The UN Security Council released a statement that its members "condemn in the strongest possible terms today's terrorist attack in Nairobi."
Around 9:30 a.m.: A barrage of gunfire erupted from the mall, and moments later two wounded Kenyan security forces were carried out of the building.
11 a.m.: Security remained tight around the Westgate, with helicopters hovering overhead.
Around 11:55 a.m.: Kenyan Interior Cabinet Secretary Ole Lenku said at a press conference that 59 people had been confirmed dead and at least 175 people had been injured. Ten to 15 attackers were still in the mall, and 1,000 people had been rescued so far, he said. Kenyan security forces were in control of the CCTV room and were monitoring the situation, he added. There were still some people inside the mall, and the situation remained a national security operation, he added.
• Note: A full 24 hours passed since the attack began.
6:20 p.m.: Police have pushed back the perimeter and blocked more roads.
The Associated Press, the New York Times and the BBC contributed to this report.