Sunai Manomai-udom, head of the justice ministry's Department of Special Investigation, said authorities now believe Muslim militants could have been behind the bomb blasts on New Year's Eve. Sunai said that a man caught on a security camera near one of the bombing sites was Thawansak Jehna, who is a suspect in a series of bank bombs in the three southernmost provinces. Sunai said police and DSI investigators had spotted Thawansak, along with another man and a woman, on security video from a mall where a bomb hidden in a tube of potato chips had been defused.