Bangkok:  A Thai court has allowed police to extend the detention of one of the Iranian suspects in an alleged terror plot that was exposed by an accidental blast in a residential neighbourhood.

Police Maj Gen Piya Uthayo said on Wednesday that Mohammad Kharzei will be held at a Bangkok prison for at least 12 more days. He was arrested on charges of being an accomplice to possession of unlawful explosives and causing explosions that damaged property and harmed other people.

Three men identified as Iranians fled the house where the blast occurred February 14.

Police found bombs in the house, but are still not clear about the suspects' intentions.

Thailand has one other man in custody and is seeking extradition of the third man, who fled to Malaysia.