People gather at the blast site in southwest Pakistan's Chaman on August 21, 2013. At least two people were killed and 15 others injured on Wednesday afternoon when a bomb blast hit a railway station in Chaman, local media and official said. (Xinhua/Stringer)

Security officials gather at the blast site in southwest Pakistan's Chaman on August 21, 2013. At least two people were killed and 15 others injured on Wednesday afternoon when a bomb blast hit a railway station in Chaman, local media and official said. (Xinhua/Stringer)

Damaged vehicles are seen at the blast site in southwest Pakistan's Chaman on August 21, 2013. At least two people were killed and 15 others injured on Wednesday afternoon when a bomb blast hit a railway station in Chaman, local media and official said. (Xinhua/Stringer)