A huge fire has broke out in a favela of Brazil's most populous city Sao Paulo.

The number of casualties in the incident is still unknown, but authorities say at least 120 houses have been destroyed. Dozens of firefighters and several fire engines were deployed after the fire began at the Paraisopolis slum at 17:00 local time on Saturday, but the flames quickly engulfed the flimsy structures. Many of Brazil's poorest residents live in urban slums.