AMMAN, Jordan (AP) – At least two of the Amman hotel bombers spoke with Iraqi accents, police said Saturday, as security forces hunted for eight vehicles believed linked to the triple attacks.

Police also investigated the theory that two bombs, one attached to a suicide attacker and another ball-bearing-packed package, exploded during the wedding attended by almost 300 Jordanians and Palestinians at one of the hotels attacked Wednesday.

Al-Qaeda in Iraq, the militant group headed by Jordanian-born fugitive Abu Musab al-Zarqawi, claimed four Iraqis, including a husband and wife, carried out the near simultaneous bombings on the Grand Hyatt, Radisson SAS and Days Inn hotels. The attacks killed at least 57 people, including three Americans.

Jordanian authorities have recovered the remains of only three men believed to have detonated explosives worn underneath their clothing. No female has so far been identified.

Security forces have rounded up scores of people, mainly Iraqis and Jordanians, in the hunt for accomplices in the three coordinated bombings. At least 12 people are being interrogated as suspects linked to the suicide attacks.

The Days Inn bomber argued with hotel staff shortly before detonating a belt packed with up to 22 pounds of explosives, likely TNT, at the building”s entrance, a senior police official said Saturday on condition of anonymity because he was unauthorized to speak to the media.

The bomber ordered an orange juice and spoke in an Iraqi accent to staff, who asked him to move from an area where he was sitting because it was designated as a &#34place for families&#34 and not single men, the official said.

&#34The man became angry and started mumbling words in an Iraqi accent that the waiter believed were insults before leaving the hotel,&#34 the official said.

Hotel staff saw the man then kneel to the ground and start tugging at something from under his jacket, apparently fighting with a faulty primer cord for his explosives, which finally detonated, blowing his body apart and killing three members of a Chinese military delegation, the official said.

Waiters also told police that the morning before the attack, two men entered the hotel and appeared to be staking out the premises before leaving shortly after, the official added.

Police had already revealed that the Hyatt bomber also spoke with people in the hotel”s lobby in an Iraqi accent before detonating his explosives.

Suspicion about the bombers has increasingly fallen on insurgents fighting U.S. and Iraqi forces across Jordan”s eastern border with Iraq.

Al-Zarqawi, who has been sentenced to death in absentia in Jordan for terror crimes, is believed to have trained more than 100 Iraqi militants to carry out suicide bombings in Iraq and possibly elsewhere in the Mideast.

The attacks bore all the hallmarks of al-Zarqawi”s group, one of Jordan”s top policemen said, adding those hotels and other &#34unsuspecting places&#34 could be hit again.

&#34The threat still exists against those places and others and we are meeting non-stop to determine potential targets and implement required protection,&#34 Maj. Gen. Mohammad al-Eitan, general director of public security, told a state-run Jordan TV station.

Police are investigating the theory that two bombs, a TNT-ladened explosives belt worn by the militant and a parcel bomb packed with ball bearings, exploded in a ballroom during a wedding at the third hotel, the Radisson, the official said.

Many of those killed and maimed in the Radisson attack suffered wounds caused by ball-bearings, indicating that the TNT-packed belt worn by the bomber was not the only explosive device used, he said.

If TNT was used, it would have had to have been smuggled into Jordan, because that type of explosive is not available in the country, the official added.

Meanwhile, police released details of eight vehicles spotted by witnesses at the hotels at the time of the attacks. It was unclear what role, if any, the vehicles had in the blasts.

Two of the vehicles, a GMC Suburban four-wheel drive and a Mercedes Benz sedan, had Iraqi license plates, while the six others had Jordanian plates and included several rented cars and a van.

Jordanians across the country are seething over the attacks and thousands have turned out for two days of protests to condemn al-Qaeda in Iraq.

While not unaccustomed to terror-related violence and plots, Wednesday”s attacks were this kingdom”s deadliest ever.

With the bulk of the victims being Arabs and Muslims, Jordanians and many of this kingdom”s 400,000 Iraqi expatriates have condemned al-Qaeda for turning their sights from U.S.-led occupation forces in Iraq onto fellow Muslims.

U.S. authorities said three of those killed were Americans, including Syrian-born Hollywood filmmaker Mustapha Akkad and his daughter, Rima Akkad Monla. Up to four more Americans were wounded, two seriously.

Al-Qaeda in Iraq, which has released three statements since the attacks, claimed the four Iraqi attackers staked out the hotels for a month before donning explosive belts and detonating them minutes apart.

It said the bombings were carried out in response to &#34the conspiracy against the Sunnis,&#34 referring to the Muslim Arab group favored under Saddam Hussein”s regime and now believed to form the core of the Iraqi insurgency.

Al-Qaeda justified the attacks on the grounds the hotels were &#34favorite places for the work of the intelligence organs, especially those of the Americans, the Israelis and some western European countries.&#34 But more than half of those killed were Jordanians.