In this Thursday, August 11, 2016, photo, the injured are helped after a bomb blast in the southern resort city of Hua Hin, 240 kilometers (150 miles) south of Bangkok, Thailand. Police are investigating a series of bomb blasts in Hua Hin and other cities in Thailand. (Photo by Daily News via AP Photo)





In this Thursday, August 11, 2016, photo, rescue workers help an unidentified woman after a bomb blast in the southern resort city of Hua Hin, 240 kilometers (150 miles) south of Bangkok, Thailand. (Photo by Daily News via AP Photo)





In this Thursday, August 11, 2016, photo, an injured person is helped after a bomb blast in the southern resort city of Hua Hin, 240 kilometers (150 miles) south of Bangkok, Thailand. (Photo by Daily News via AP Photo)





This photo taken on August 11, 2016 shows an injured tourist being helped after twin bombs exploded in the upscale resort of Hua Hin, Thailand. A string of bomb attacks targeting Thailand's crucial tourism industry have killed four people, officials said on August 12, sending authorities scrambling to identify a motive and find the perpetrators. (Photo by AFP Photo/DailyNews)





Injured people receive first aid after a bomb exploded on August 11, 2016 in Trang, Thailand. (Photo by Reuters/Dailynews)





Injured people receive first aid after a bomb exploded on August 11, 2016 in Trang, Thailand. (Photo by Reuters/Dailynews)





Injured people receive first aid after a bomb exploded on August 11, 2016 in Trang, Thailand. (Photo by Reuters/Dailynews)





Injured person receives first aid after two bombs exploded on August 12, 2016 in the Thai seaside resort of Hua Hin, Thailand. (Photo by Reuters/Dailynews)





An injured woman is seen on the scene after two bombs exploded on August 12, 2016 in the Thai seaside resort of Hua Hin, Thailand. (Photo by Reuters/Dailynews)





An injured woman is stretchered into an ambulance after two bombs exploded on August 12, 2016 in the Thai seaside resort of Hua Hin, Thailand. (Photo by Reuters/Dailynews)