Rescuers search for survivors at the building collapse site in downtown Dar es Salaam, Tanzania, March 30, 2013. The number of people killed after a 16-storey building collapsed in Dar es Salaam has risen to 20, police confirmed on Saturday. (Xinhua/Zhang Ping)

Body of a victim is found at the building collapse site in downtown Dar es Salaam, Tanzania, March 30, 2013. The number of people killed after a 16-storey building collapsed in Dar es Salaam has risen to 20, police confirmed on Saturday. (Xinhua/Zhang Ping)

Rescuers clean up the building collapse site in downtown Dar es Salaam, Tanzania, March 30, 2013. The number of people killed after a 16-storey building collapsed in Dar es Salaam has risen to 20, police confirmed on Saturday. (Xinhua/Zhang Ping) (syq)