Powerful explosions struck three hotels in the Jordanian capital Amman Wednesday night, killing more than 57 people and wounding 300 others, The Associated Press reported.
Reports say that most of the casualties are Jordanians.
Among the dead are five Iraqis, Arabs from several other countries, one Indonesian and three Chinese.
The authorities say 30 of the dead have not yet been identified.
The first explosion took place at about 8:50 p.m. (1850 GMT) at the Grand Hyatt hotel, popular with tourists and diplomats.
One correspondent said at least seven people died there. Police said there were many others wounded.
A U.S. businessman at the Grand Hyatt said a bomb exploded in the lobby. Witnesses saw smoke rising from the building.
A few minutes later, another blast hit the nearby Radisson SAS Hotel. Police sources said five people were killed and more than 20 injured.
Another explosion was reported at the Days Inn Hotel, and police said there were many casualties.
Worst attack
The explosion at the Radisson SAS was the worst as the bomb exploded in a banqueting room while guests were enjoying a wedding party.
The bride and groom each lost a parent and were themselves wounded.
"There were a lot of injured people and some dead people. Some of them are from my family and some are from my wife's family," the groom, Ashraf al-Khaled, said.
"We tried to save as many people as we could, but God took some."
"I lost my father and my father-in-law on my wedding night," he added. "The world has to know that this has nothing to do with Islam."
Security has been tightened around the Jordanian capital, and the country's land borders have been closed.
Roadblocks were established around hotels and embassies, and Prime Minister Adnan Badra ordered all schools and public offices to close on Thursday.
Jordan's Deputy Prime Minister Marwan Muasher said that al-Qaeda fighters were a "prime suspect" for the attacks.
He said that two of the blasts appeared to have been carried out by human bombers, and the third by a car bomb.
Condemnation
King Abdullah II, who cut short his visit to Kazakhstan and returned to Jordan, said the bloody attacks were "terrorist acts" and pledged that "justice will pursue the criminals".
The Jordanian government has declared a day of national mourning for the victims.
A White House spokesman denounced the attacks as a "henious act of terror".
UN Secretary General Kofi Annan has delayed a scheduled visit to Jordan.
Jordan, a close U.S. ally, has been a target for several attacks.
One correspondent in Amman says Jordanian authorities have been expecting these attacks for months.