An injured woman receives medical treatment at a hospital in Lahore, eastern Pakistan, Nov. 26, 2012. At least seven people were killed and four others injured when a passenger bus exploded in Lahore on Monday, reported local media Express. (Xinhua/Jamil Ahmed)

An injured man receives medical treatment at a hospital in Lahore, eastern Pakistan, Nov. 26, 2012. At least seven people were killed and four others injured when a passenger bus exploded in Lahore on Monday, reported local media Express. (Xinhua/Jamil Ahmed)

An injured woman receives medical treatment at a hospital in Lahore, eastern Pakistan, Nov. 26, 2012. At least seven people were killed and four others injured when a passenger bus exploded in Lahore on Monday, reported local media Express. (Xinhua/Jamil Ahmed)