Thai authorities are casting a wider net in the search for the perpetrators of the Aug. 17 bombing in Bangkok that killed 20 people, asking China to check whether a prime suspect had fled there.

Prime Minister Prayuth Chan-ocha has confirmed reports that a man carrying a Chinese passport in the name Abudureheman Abudusataer had gone from Thailand on Aug. 16 to Bangladesh and continued on to China. Prayuth said Friday that he did not know whether China would hand over the suspect if or when he was arrested.

Bangladesh's ambassador to Thailand confirmed to reporters that the suspect left Bangladesh on Aug. 30 and was supposed to transit in Delhi on his way to China but never got to his final destination.