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A Thai firefighter looks at fire raging after an explosion at a scrap shop in Bangkok, Thailand, Wednesday, April 2, 2014. (AP Photo) ( Thailand Explosion )

Thai firefighters fight the blaze after an explosion at a scrap shop in Bangkok, Thailand Wednesday, April 2, 2014. (AP Photo) ( Thailand Explosion )

A Thai fireman (L) stands inside a scrap metal warehouse after a massive World War II bomb that workers tried to cut open exploded in Bangkok on April 2, 2014, killing at least seven people died and injuring 19 others, officials said. AFP PHOTOSTR/AFP/Getty Images ( 528584185 )

Thai soldiers stand next to a crater created by a bomb explosion at a scrap shop in Bangkok, Thailand, Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )

Thai charity workers stand next to a crater created by a bomb explosion at a scrap shop in Bangkok, Thailand Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )

Thai firemen fight the blaze after an explosion at a scrap shop in Bangkok, Thailand, Wednesday, April 2, 2014. (AP Photo) ( Thailand Explosion )

Thai charity workers sift through the wreckage of a scrap shop after a bomb explosion in Bangkok, Thailand Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )

Thai charity workers carry the body of a bomb explosion victim, wrapped in white cloth, at a scrap shop in Bangkok, Thailand, Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )

A Thai charity worker, center, looks for more evidence after a bomb explosion at a scrap shop in Bangkok, Thailand, Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )

A Thai soldier talks on a mobile phone as his colleague, right, stands nearby while working at an explosion site at a scrap shop in Bangkok, Thailand Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )

Residents, right, sift through the wreckage of a scrap shop as Thai soldiers, left, watch after a bomb explosion in Bangkok, Thailand Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )

Thai charity workers sift through the wreckage of a building after a bomb explosion at a scrap shop in Bangkok, Thailand Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )

Thai charity workers sift through the wreckage of a scrap shop after a bomb explosion in Bangkok, Thailand Wednesday, April 2, 2014. (AP Photo/Apichart Weerawong) ( Thailand Explosion )