At least six people were killed early Tuesday when a commercial building under construction collapsed in eastern Sao Paulo, firefighters said.

At least six people were killed early Tuesday when a commercial building under construction collapsed in eastern Sao Paulo, firefighters said.

"There are six dead and 11 people were rescued alive," a fire department spokesman said in an updated toll. "We do not know exactly how many more people there are under the rubble."

Local press reports said 19 people were injured in the accident.

Television pictures showed extensive damage as rescue workers frantically sifted through rubble in search of survivors.

More than 20 fire department vehicles and two helicopters were on the scene.