Thai police said on Monday that they were questioning three more Iranians in connection with an alleged plot to kill Israeli diplomats in Bangkok.
"We have information that they may have links to the blasts," Police Major General Piya Utayo told AFP, referring to a series of botched explosions that shook a residential district of the Thai capital on February 14.
He said no charges had been laid against the trio. One was detained under immigration law for overstaying his visa.
According to Thai media, mobile telephone call logs showed that one of the suspects had been in regular contact with two Iranians now in custody, one of whom had his legs blown off as he hurled a bomb at police while fleeing.
Another suspect was detained in Malaysia while arrest warrants have been issued for two more Iranians believed to have left the country.
Thai police have said they believe that Israeli diplomats were the intended target of the botched plot, but Tehran has rejected accusations that it is behind a terror campaign against the Jewish state.