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Surrounded by hookah water pipes and a drink-filled table, Mr. Kharzei and Mr. Sedaghatzadeh cradled women in their arms, while Mr. Moradi reclined on a cushion.

The group drank and played pool together, according to the report, then headed to Bangkok to stay at the house Ms. Rohani had arranged for them.

Plot goes awry

Whatever the men were planning went awry on the afternoon of Feb. 14, when an explosives cache stored at the home ignited by mistake. The blast blew the roof off an entire front room, showering the driveway and a grass courtyard with debris.

A closed-circuit video camera installed on the street outside showed the Iranians emerge, one by one.

First out was an apparently barefoot Mr. Sedaghatzadeh, wearing shorts and sunglasses. Mr. Kharzei was next, carrying a large backpack strung over his shoulder.

By the time Mr. Moradi finally came out, about five minutes later, a small crowd had begun to gather. The bystanders recoiled in fear, backing up and turning away as Mr. Moradi strode past wearing a jacket and a black backpack. Blood appeared to drip from a wound on the left side of his face.

In each hand, he carried what appeared to be portable radios, possibly homemade “sticky” bombs.

As Mr. Moradi tried to flee, a red taxi passed and, for reasons that remain unclear, he dropped one of the bombs onto the road in front of it, blowing apart the vehicle’s front end and wounding the driver and three other Thai bystanders.

Mr. Moradi turned onto a main road as police began moving in. One of them, Sgt. Panphum Rakkuson, said the Iranian pulled a rectangular-shaped box out of his backpack and threw it toward the officers.

“We were stunned and couldn’t do anything but stand there,” Sgt. Panphum said.

The bomb, though, got caught on something, hit the ground next to Mr. Moradi and exploded. The blast instantly shredded both of his legs below the knee.

Mr. Moradi is in police custody at a Bangkok hospital. Mr. Kharzei was arrested at the international airport that night, trying to board a flight to Iran. Mr. Sedaghatzadeh was detained the next day in Malaysia and may eventually be extradited to Thailand.

Thai courts have issued arrest warrants for all three men, as well as for Ms. Rohani and a fifth Iranian, Norouzi Shayan Ali Akbar, 57.

Mr. Akbar, with dark hair and a silver beard, was caught on closed-circuit TV footage leaving the Iranians’ home the morning of the blast. Deputy national police chief Gen. Pansiri Prapawat said Mr. Akbar was en route to the airport, where he took a flight to Tehran.

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