AFP:

“These three Iranian men are an assassination team and their targets were Israeli diplomats including the ambassador,” a senior Thai intelligence official told AFP, speaking on condition of anonymity.

“Their plan was to attach bombs to diplomats’ cars.”
…
Explosives and magnets were later found inside the partially destroyed house, police said.

Individuals appeared to be the target of the botched plot as the devices were not powerful enough to cause large-scale damage, said Thailand’s National Security Council chief Wichean Potephosree.

“Yesterday’s incident was caused by current international tensions in world politics,” he told a news conference

BP: It would be unusual for the Thai government to go on the record and accuse Iran, but if you read through the lines Wichaen’s wording is in line with the intelligence source. What further information will they find out from the two suspects in Thai custody? What will this mean for Thai-Iranian relations?

No direct response from Iran to this story although they deny the statements by Israeli Ministers linking the attacks to Iran:

Foreign ministry spokesman Ramin Mehmanparast “rejected the accusations by the Zionist regime of implication (of Iran) and accused that regime of trying to harm the friendly and historic relations between Iran and Thailand,” according to the Iranian state television website.