One of the men arrested over the bomb blast in Bangkok last month that killed 20 people.
Thai police said today that one of the two suspected detained after the explosion has confessed to possession of bomb-making materials.
Yusufu Mieraili was carrying a passport that described him as from Xinjiang in China when captured, according to the Bangkok Post.
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Earlier this month Thailand's Prime Minister said a foreign man had been arrested in relation to the bombing near the Cambodian border.
The blast happened at a sacred shine in the capital city three weeks ago.