Thai police are questioning an Iranian man who may be linked to explosions in the capital in February.
Three Iranians are now in custody in Thailand while another is awaiting extradition from Malaysia and 2 are believed to have fled to Iran.
The police say the Iranians were planning to attack Israeli diplomats as they traveled to or from their embassy.
Instead, they accidentally blew up the house they had been renting in suburban Bangkok.
Two of the men fled and were later detained.
As the police continue to name more suspects they believe may have been involved in the plot, the Jewish community remains nervous.
Al Jazeera's Wayne Hay reports from Bangkok on how the investigation has affected many people in the Iranian community.