Recovery begins in Kenya

The collapsed upper car park of the Westgate Mall in Nairobi, Kenya, Sept. 26, 2013.

Working near bodies crushed by rubble in a bullet-scarred, scorched mall, FBI agents continued fingerprint, DNA and ballistic analysis to help determine the identities and nationalities of victims and al-Shabab gunmen who attacked the shopping center, killing more than 60 people.

A top-ranking government official tells The Associated Press that Kenya's military caused the massive collapse of three floors in the mall during the terrorist siege.

Read more: Kenya military caused Westgate Mall collapse, official says

A cemetery worker washes his hands next to five fresh graves after the funeral ceremony of Ruhila Adatia Sood, A Radio Africa television and radio presenter, in Nairobi, Kenya, Sept. 26, 2013.

The country is observing three days of national mourning as security forces begin the task of clearing and securing the Westgate shopping mall following a four-day siege by militants.

The collapsed upper car park of the Westgate Mall in Nairobi, Sept. 26, 2013.

Kenyan security personal patrol outside the Westgate Mall, Sept. 26, 2013.

The collapsed upper car park of the Westgate Mall in Nairobi, Sept. 26, 2013.

Kenyans look at the Westgate Mall in Nairobi, Sept. 26, 2013.

Kenyan Presidential Press Service via Getty Images

The remains of cars and other debris can be seen in a general view photographed from the rooftop, of the parking lot outside the Westgate Mall, Sept. 26, 2013.

People donate blood for the victims of the deadly four-day siege at the Westgate Mall, Sept. 25, 2013.

The remains of cars and other debris can be seen in a general view photographed outside the Westgate Mall, Sept. 26, 2013.

A man reads the newspaper in Nairobi after Kenyan forces took back control of the Westgate Mall following a deadly four-day siege, Sept. 25, 2013.

The remains of cars and other debris can be seen in a general view photographed from the rooftop, of the parking lot outside the Westgate Mall, Sept. 26, 2013.

Kenyans look over a wall at the funeral for Selima Merali, 41, and her daughter Nuriana Merali, 15, who were killed in the attack by gunmen at the Westgate Mall, Sept. 25, 2013, in Nairobi, Kenya.

A worker cleans near the ashes of two of the victims from the Westgate Mall attack at a local crematorium a day after their funeral in Nairobi, Sept. 26, 2013.

A cemetery worker carries a coffin cover during the funeral ceremony of Ruhila Adatia Sood, a Radio Africa television and radio presenter, Sept. 26, 2013, in Nairobi, Kenya.

Kenyan soldiers walk on the road outside the Westgate Mall in Nairobi, Sept. 26, 2013.

Dawn breaks over the still-smoldering Westgate Mall in Nairobi, Kenya, Sept. 26, 2013.

Friends and relatives mourn during a funeral service for Selima Merali, 41, and her daughter Nuriana Merali, 15, who were killed in the attack by gunmen at the Westgate Mall, Sept. 25, 2013, in Nairobi.