Brazil Building Collapse Leaves Six People Dead - Sky News

At least six people have been killed after a commercial building collapsed in Brazil's biggest city.

The scene of the collapsed building in Sao Paulo

At least 11 people were pulled alive from the rubble, but an unknown number remained trapped under the debris according to the authorities in Sao Paulo.

It was not immediately clear what caused the two-storey building to collapse, according to firefighters.

It was under construction at the time and 'pancaked' down on top of itself, trapping those inside.

A rescue worker searches for victims with a sniffer dog

Firefighters spent the day carefully searched through the rubble, using dogs to help locate victims.

"The work of finding victims requires patience and a skilled search," Captain Marcos Palumbo of the fire department said. 

"The number of deaths is likely to rise. It's a situation full of risk and difficult access. The teams haven't had more contact with anybody else under the rubble."

Nearby vehicles were covered with slabs of concrete which broke free from the building as it collapsed.

Rescue workers transport a victim from the scene