Police probing Thailand’s deadliest bombing widened their net in the search for more suspects on Sunday after a foreigner was arrested and stacks of fake passports and bomb-making materials were found during a raid on a Bangkok apartment block. The 28-year-old man, who has been in Thailand since January 2014, was detained on charges of possessing illegal explosives. Police have not revealed his identity or nationality. The Aug. 17 bomb at Bangkok’s Erawan Shrine, where Thais and Asian tourists flock each day, stunned Thailand. Fourteen foreigners, seven from mainland China and Hong Kong, were among the 20 killed in an attack the ruling junta said was intended to cripple an already flagging economy.