RIO-DE-JANEIRO, September 24 (RIA Novosti) - At least 11 people died in an explosion at a firework warehouse outside Sao Paulo, local media said, citing fire officials on Thursday.

At least 10 people were injured in the warehouse blast, which destroyed at least four nearby homes.

Some 170 rescue workers are at the scene trying to locate people in the debris, while some 15 firefighting units are involved in tackling the blaze.