Story highlights Copies of the passport have been sent to China and Turkey

Yusufu Meerailee spoke Turkish during his police interrogation

Thai police believe he gave explosives to the bomber near the rail station

(CNN) Thai police have said one of the suspects in custody over last month's deadly shrine bombing in Bangkok has a Chinese passport and that he's from the country's Xinjiang region.

Yusufu Meerailee was arrested last week trying to flee across the Thai border into Cambodia -- he has since confessed to carrying a rucksack that contained the bomb that killed 20 people at the Erawan Shrine. He said he exchanged the rucksack with a man caught on CCTV wearing a yellow t-shirt shortly before the attack.

Authorities revealed that he spoke Turkish, English and Arabic, with the interrogation conducted through a translator.

National Police spokesman Prawut Thavonsiri said Thursday that they've sent copies of the passport to both Turkey and China, as they check the document's authenticity.

Chinese Foreign Ministry spokesman Hong Lei told reporters at a daily press briefing Thursday that "China is following the investigation of this case and has been in close contact with Thai authorities. I want to emphasize that anyone who has committed such a heinous crime is bound to face severe punishment. China will continue to strengthen cooperation with relevant sides on law enforcement and security matters."

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