20 people died I a collapse of a building

 of a residential building in the northern Colombian city of Cartagena, the mayor said on Twitter Saturday after a two - day rescue operation .
The tragedy occurred Thursday, when the six- story building came crashing down for reasons that are being investigated, the Red Cross said .
Emergency personnel saved 41 people from the rubble, 16 of them badly hurt.
The mayor , Manolo Duque, said 12 of the 20 people killed had been identified so far . A mass was being held late Saturday for the