BANGKOK • Three explosions rattled downtown Bangkok Tuesday, a day after bombers targeted Israeli Embassy staff in India and the Repubic of Georgia, and police announced that at least one of the suspects in Thailand's capital was an Iranian national.

Israeli officials quickly blamed Iran for the afternoon blasts, which authorities said injured the Iranian and four Thais.

"I would like to ask the people not to panic," Prime Minister Yingluck Shinawatra said as security was stepped up throughout the Thai capital. "The authorities have now arrested an attacker."

Thai police said an explosive device detonated in a home rented by Iranians in downtown Bangkok's Sukhumvit Road area. Two men in the house managed to escape while a third reportedly tried to flag a taxi, which refused to stop given the man's bloodied condition.

The man then threw a grenade at the taxi, Bangkok Police Deputy Commissioner Pisit Pisutsak told reporters, injuring the driver. As police closed in, the suspect also threw a grenade at them — only to have it detonate near the attacker, seriously injuring his legs.

Police arrested the man, identified as Saci Morabi, 50, and took him to the hospital where he faced questioning.

A manhunt followed for the other two suspects. A man thought to be one of them was subsequently arrested at Bangkok's international airport trying to board a flight to Malaysia. He was variously identified as Mohamed Hazaei or Mohamed Hasahi, 41.

Government spokeswoman Thitima Chaiseng said the police found papers indicating the injured suspect was Iranian. "However we do not know yet about the second and third men and are awaiting police information on that," she added.

The Bangkok blasts followed an attack Monday on an Israeli diplomatic vehicle in New Delhi, which injured four people, and a failed attempt to blow up an Israeli vehicle in the Georgian capital of Tblisi.

On a trip to Singapore, Israeli Defense Minister Ehud Barak said the Bangkok incident proved "once again that Iran and its proxies are continuing to perpetrate terrorism." He added: "The recent attacks are yet another example of this."

Rohan Gunaratna, head of the International Center for Political Violence and Terrorism Research at Singapore's Nanyang Technological University, said the two days of explosions suggest the start of an Asian terror wave by Hezbollah operatives.

However, other experts were more skeptical, calling the attacks ''highly amateurish.''