Photo taken on March 19, 2013 shows the blast locale of a residential building in Wuhan, capital of Central China's Hubei Province. An explosion ripped through a residential building in Wuhan Tuesday night. Casualties from the blast that broke out at around 10 pm in Hanlai Square in the city's Hankou District are still unknown. (Xinhua/Cheng Min)
Photo taken on March 19, 2013 shows the blast locale of a residential building in Wuhan, capital of Central China's Hubei Province. An explosion ripped through a residential building in Wuhan Tuesday night. Casualties from the blast that broke out at around 10 pm in Hanlai Square in the city's Hankou District are still unknown. (Xinhua/Cheng Min)
Fire fighters work at the blast locale of a residential building in Wuhan, capital of Central China's Hubei Province, March 19, 2013. An explosion ripped through a residential building in Wuhan Tuesday night. Casualties from the blast that broke out at around 10 pm in Hanlai Square in the city's Hankou District are still unknown. (Xinhua/Cheng Min)
Fire fighters work at the blast locale of a residential building in Wuhan, capital of Central China's Hubei Province, March 19, 2013. An explosion ripped through a residential building in Wuhan Tuesday night. Casualties from the blast that broke out at around 10 pm in Hanlai Square in the city's Hankou District are still unknown. (Xinhua/Cheng Min)
Fire fighters work at the blast locale of a residential building in Wuhan, capital of Central China's Hubei Province, March 19, 2013. An explosion ripped through a residential building in Wuhan Tuesday night. Casualties from the blast that broke out at around 10 pm in Hanlai Square in the city's Hankou District are still unknown. (Xinhua/Cheng Min)
Fire and smoke are seen at a residential building in Wuhan, capital of Central China's Hubei Province, March 19, 2013. An explosion ripped through a residential building in Wuhan Tuesday night. Casualties of the blast are still unknown. (Xinhua/Liu Wei)