Turkish authorities on Tuesday charged the prime suspect in the twin car bombings that left 51 people dead in a town near the Syrian border, the state-run Anatolia news agency reported.

The man, who was arrested trying to cross into Syria along with two accomplices, is alleged to have purchased the vehicles used in the bombings. Four other suspects were also charged.

The families of the Lebanese pilgrims held in Syria's Aazaz region sneaked into the Turkish Cultural Center in downtown Beirut on Monday to protest the ongoing abduction of their loved ones, reported LBCI television.

They then headed to the office of the center's director, where they said that they would keep him locked up until the building is shut down.

A Brazilian and a Spanish tourist died Monday and 23 other people were hurt after two hot-air balloons collided in a beauty spot in central Turkey, officials said.

The accident occurred over Cappadocia's sculpted rock formations when one balloon collided with the basket of another balloon above and crashed to the ground, the governor of Nevsehir province, Abdurrahman Savas, told Anatolia news agency.

Turkish Prime Minister Recep Tayyip Erdogan will sue opposition leader Kemal Kilicdaroglu after he compared him to Syria's embattled president over deadly bombings near the border, media reported Saturday.

"We will not allow anyone to call the prime minister of the Turkish Republic a 'murderer'," Erdogan was quoted as saying by the Vatan newspaper during a visit to Washington.

Any decision on an eventual no-fly zone over Syria would have to be made by the United Nations, Turkish Prime Minister Recep Tayyip Erdogan insisted on Friday.

"With respect to no-fly zone, I would like to make one observation: this is not a decision that could be taken between the U.S. and Turkey," Erdogan told a Washington think-tank during a trip to the United States.

Middle East peace will prove impossible without Palestinian unity, Turkish Prime Minister Recep Tayyip Erdogan warned Friday, suggesting Ankara could help reconcile the Fatah and Hamas parties.

"The process of unity between Fatah and Hamas, this has to be achieved," Erdogan told a Washington think tank during a visit to the United States.

At least 10 people were killed on Friday in an explosion after alleged smugglers set a fuel depot on fire in response to a police crackdown, a local official said.

The suspects set ablaze an illegal fuel depot located in the basement of a three-story building in a small village near Turkey's border with Syria, triggering a strong explosion that also wounded nine people.

More than 1.5 million Syrians have fled their conflict-ravaged homeland, the U.N.'s refugee agency said Friday, warning that the real figure could be even higher as the tally only reflected those who register with aid groups.

Dan McNorton, spokesman for the U.N. High Commissioner for Refugees, told reporters that close to 250,000 Syrians were being registered each month.

Turkey has arrested one of the major suspects in the twin car bombings that killed at least 51 people in a city near the Syrian border, the city's governor said on Friday.

"We captured one of the chief actors involved in the incident at 11:40 pm last night," said Celalettin Lekesiz, governor of southeastern Turkey's Hatay city where the bombs went off.

Moody's has raised Turkey's bond rating to investment grade, the rating agency said Thursday, citing improved economic and public finance measures and progress on reforms.

The government-bond ratings went up a notch to Baa3, the first step into investment grade, from Ba1, with outlook considered stable.