Thai investigators believe they have found a link between this week's bomb blasts in Bangkok and New Delhi, a senior security official said yesterday.

Israeli Prime Minister Benjamin Netanyahu, accusing Iran of targeting diplomats, said if the world did not stop Iran's "aggression", the attacks would spread.

Iran, whose leaders had threatened to retaliate for Israel's alleged car bomb assassination of several of its nuclear scientists, denied involvement in the attacks on Monday and Tuesday, including a bomb that failed to explode in the Georgian capital, Tbilisi. Iran blamed them on Israel.

Asked whether the explosives used in India and Thailand were the same, a senior Thai security official said they both had the same "magnetic sheets".

"The individual was in possession of the same magnets and we are currently examining the source of the magnet," National Security Council Secretary Wichian Podphosri said.

A man carrying an Iranian passport lost a leg when a bomb he was carrying in Bangkok went off on Tuesday after an earlier explosion, apparently accidental, at a house he was renting. His other leg had to be amputated.

The suspect, identified as Saeid Moradi, was in a stable condition in a Bangkok hospital, although he remained unconscious after 10 hours of surgery, said hospital surgeon Suparung Preechayuth.

Police said he had been charged with illegal possession of explosives, causing explosions, attempted murder and assaulting a police officer. Two other men shared the rented house with him. One was arrested at Bangkok's International Airport on Tuesday, but he has not yet been charged.

The other was arrested yesterday afternoon at Kuala Lumpur Airport as he tried to board a plane to Teheran, Malaysian police said. The suspect, in his 30s, had evaded authorities at Bangkok Airport and flown to Malaysia.