Rescue workers in Angola's capital Luanda are still trying to reach people trapped in a six-story police building that collapsed on Saturday.
At least four people died and more than 100 others were injured when the headquarters of the National Criminal Investigation Department fell to the ground.
Sunday, Angolan police chief Ambrosio de Lemos expressed hope that more people would be found alive. State media quoted him as saying debris must be removed carefully so survivors can be retrieved.
Rescuers are trying to reach a block of prison cells holding 10 women. Workers made contact with the women Saturday after getting a cell phone to them.
Officials have not identified the cause of the collapse.
Lemos said Saturday that there was no "external factor" involved.
Some information for this report was provided by AFP and Reuters.