BANGKOK — The alleged mastermind behind the bomb attack that killed 20 people in Bangkok last month has fled to Bangladesh, a police official said.

Police Gen. Chakthip Chaichinda, deputy chief of the Royal Thai Police, said yesterday they will ask Bangladeshi authorities to help track down the man, called Abudusatar Abudureh, aka “Izaan,” who bombing suspect Yusufu Mieraili has told police gave orders to those who carried out the attack and left Thailand one day before the bombing.

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