BANGKOK — While the search continues for the prime suspect in Monday’s terror attack, police have added three more unidentified suspects to their hunt and, three days into the investigation, reached out today for international help.

Three days after the Erawan Shrine bombing killed 20 people in downtown Bangkok, the widening investigation has failed to locate or identify any suspects, prompting police to request aid from Interpol in tracking down members of a network they now say includes no fewer than 10 people.

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