Car bombs tore Wednesday through Syria's second city Aleppo, leaving dozens dead, as violence across the country killed 147 people, monitors said.

Two blasts went off in quick succession near a military officers' club around Aleppo's Saadallah al-Jabiri Square, ripping off a hotel's facade and flattening a two-story cafe, an Agence France Presse correspondent reported.

The U.S. military and intelligence agencies are compiling detailed dossiers on those believed to have attacked the U.S. consulate in Libya ahead of possible retaliation, the New York Times reported.

Citing U.S. officials, the Times reported late Tuesday that the top-secret Joint Special Operations Command (JSOC) was collecting information on the deadly attack last month that killed a U.S. ambassador and three other Americans.

Latin American and Arab leaders agreed to form a joint investment bank during a summit in Peru at which they also discussed the increasingly bloody civil war in Syria.

At the end of the two-day meeting on Tuesday, the heads of state announced the investment bank would integrate national banks and could finance common projects between the Union of South American Nations and the Arab League.

One person was killed and five others wounded during clashes near Bani Walid, a final bastion of supporters of slain Libyan leader Moammar Gadhafi, local leaders said Tuesday, warning of looming disaster.

"A resident of Bani Walid was killed in combat against armed groups from the city Misrata," Bani Walid spokesman Massud al-Waer told AFP.

Violence across Syria has killed at least 31,022 people, most of them civilians, since the outbreak of an anti-regime revolt in March last year, a monitoring group said.

"At least 22,257 civilians, 7,578 soldiers and 1,187 defectors have been killed in violence in the past 18 months," Syrian Observatory for Human Rights director Rami Abdel Rahman told Agence France Presse.

A Palestinian taxi injured four Israeli soldiers in a hit-and-run incident in the West Bank on Tuesday, but it was not immediately clear if it was a deliberate attack, police told Agence France Presse.

Police spokesman Micky Rosenfeld said those injured were part of a group of six soldiers standing at the side of the road alongside their vehicle, near the settlement of Neveh Daniel, southwest of Bethlehem.

The number of Syrian refugees in neighboring countries has more than tripled since June to over 300,000, and by the end of the year that number will more than double again, the U.N. refugee agency warned Tuesday.

"The latest figures show a total registered population of more than 311,500 Syrian refugees in the four countries (Jordan, Lebanon, Turkey and Iraq). You might recall there were about 100,000 as of June," UNHCR spokesman Adrian Edwards told reporters in Geneva.

Baghdad on Tuesday moved to end Turkey's military presence in north Iraq where Ankara is pursuing Kurdish rebels, signaling a further deterioration in ties between the neighbors.

Turkey has since the 1990s maintained several military bases in the autonomous Kurdistan region of north Iraq, where the Kurdistan Workers' Party (PKK) rebel group also has bases.

Iraq stopped and searched a Syria-bound Iranian cargo plane for weapons on Tuesday, but allowed it to continue as no prohibited items were found, Iraqi officials said.

Washington has been pressuring Baghdad to ensure that all Iranian planes flying through its airspace are ordered to land and checked for weapons. This is the first time Iraqi officials have said that they have done so.

Saudi Arabia beheaded a Syrian on Tuesday for drug smuggling, the interior ministry announced in a statement carried by the official SPA news agency.

Abdulrahman al-Sweidan was "arrested as he was attempting to smuggle large quantities of narcotic pills into the kingdom," SPA reported.