A vehicle's windshield is broken in an explosion at a cake shop on Guangming Road in Beijing, capital of China, July 24, 2013. A gas blast ripped through the cake shop Wednesday morning, leaving a number of people injured and vehicles damaged. (Xinhua/Li Wen)

Firemen work at the explosion site of a cake shop on Guangming Road in Beijing, capital of China, July 24, 2013. A gas blast ripped through the cake shop Wednesday morning, leaving a number of people injured and vehicles damaged. (Xinhua/Wang Zhen)

Firemen work at the explosion site of a cake shop on Guangming Road in Beijing, capital of China, July 24, 2013. A gas blast ripped through the cake shop Wednesday morning, leaving a number of people injured and vehicles damaged. (Xinhua/Wang Zhen)

Firemen work at the explosion site of a cake shop on Guangming Road in Beijing, capital of China, July 24, 2013. A gas blast ripped through the cake shop Wednesday morning, leaving a number of people injured and vehicles damaged. (Xinhua/Wang Zhen)

Sanitation workers clean the explosion site at a cake shop on Guangming Road in Beijing, capital of China, July 24, 2013. A gas blast ripped through the cake shop Wednesday morning, leaving a number of people injured and vehicles damaged. (Xinhua/Wang Zhen)

Firemen work at the explosion site of a cake shop on Guangming Road in Beijing, capital of China, July 24, 2013. A gas blast ripped through the cake shop Wednesday morning, leaving a number of people injured and vehicles damaged. (Xinhua/Wang Zhen)

People walk past a taxi whose window glass was broken in an explosion at a cake shop on Guangming Road in Beijing, capital of China, July 24, 2013. A gas blast ripped through the cake shop Wednesday morning, leaving a number of people injured and vehicles damaged. (Xinhua/Li Wen)