Rescuers work on a flooded street in Beijing, July 22, 2012. The 20-hour storm that hit Beijing on Saturday claimed the lives of 37 people — 25 of the deaths were caused by drowning, six were killed in house collapses. [Photo/Xinhua]

Rescuers search for the passengers trapped by deep rain waters in Beijing, on July 22, 2012. The 20-hour storm that hit Beijing on Saturday claimed the lives of 37 people — 25 of the deaths were caused by drowning, six were killed in house collapses. [Photo/Xinhua]

Rescuers work on a flooded street in Beijing, July 22, 2012. The 20-hour storm that hit Beijing on Saturday claimed the lives of 37 people — 25 of the deaths were caused by drowning, six were killed in house collapses. [Photo/Xinhua]

A worker directs the traffic after the heaviest rain lashed Beijing in a toll station in Beijing, July 22, 2012. The 20-hour storm that hit Beijing on Saturday claimed the lives of 37 people — 25 of the deaths were caused by drowning, six were killed in house collapses. [Photo/Xinhua]

Rescuers search for the passengers trapped by deep rain waters in Beijing, on July 22, 2012. The 20-hour storm that hit Beijing on Saturday claimed the lives of 37 people — 25 of the deaths were caused by drowning, six were killed in house collapses. [Photo/Xinhua]