Some 600 Kurdish residents of villages in Syria's Raqa province have fled after an ultimatum from the jihadist Islamic State of Iraq and the Levant, an NGO said Thursday.

The Syrian Observatory for Human Rights said at least 600 Kurds from the villages of Tal Akhdar, Tal Fandar and the town of Tal Abyad had abandoned their homes after warnings from ISIL.

An 82-truck convoy carrying vital supplies for Syrians in the north of the country has crossed the Turkish border for the first time since the start of the civil war there, the U.N. and a Turkish official said Thursday.

The convoy contains food supplies, blankets and mattresses, family kits, hygiene kits, medicines and medical supplies for "hundreds of thousands of people desperately in need in the north of Syria", said the United Nations' regional humanitarian coordinator Nigel Fisher.

Two soldiers and a police officer were shot dead Thursday in southern Turkey when assailants carried out an attack that a top official said may be linked to events in Syria.

Using long-range rifles, they fired from a truck after being ordered to stop at a checkpoint on a highway in Ulukisla, a town near the border with Syria, according to local media.

A commuter train smashed into a minibus on a railway track in southern Turkey on Thursday, killing 10 people and injuring several others.

The bus, which was carrying workers to an industrial zone in the Mediterranean province of Mersin, was hit because the driver proceeded to cross the track "carelessly", the private Dogan News Agency reported, citing witnesses.

Turkey's parliament reconvened on Wednesday for an emergency session to hear corruption allegations against four former government ministers.

The corruption scandal, which brought down the four ministers and prompted a cabinet reshuffle in December, has evolved into the most serious challenge yet to Prime Minister Recep Tayyip Erdogan's 11-year-rule.

Turkey's national carrier denied on Wednesday allegations of arms shipments to unknown groups in Nigeria, which has been ravaged by violence between the army and Islamist militants.

"Turkish Airlines, in accordance with company policy, does not ship arms to countries ... where there is a power vacuum or conflict," the airline said in a statement sent to Agence France Presse.

A disgruntled former employee burst into a government agency in eastern Turkey on Wednesday, shooting dead six staff before taking his own life.

The gunman took his one-time colleagues hostage at the Turkish Statistical Institute in the city of Kars and then embarked on a wild shooting spree that has also left many people injured, officials said.

Four people drowned on Tuesday after a boat carrying eight Syrian immigrants trying to reach Greece capsized off western Turkey, local media reported.

Three survivors were rescued and taken to a hospital in the Turkish tourist town of Bodrum, while one person remained missing after the accident in the Aegean Sea, Dogan news agency said.

The European Court of Human Rights condemned Turkey on Tuesday over its "inhuman" treatment of jailed Kurdish rebel leader Abdullah Ocalan.

The court ruled that holding the founder of the outlawed Kurdistan Workers' Party (PKK) in isolation for more than a decade on the high-security island prison of Imrali constituted mistreatment by the Turkish authorities.

Seven migrants including two children died early on Tuesday after their boat sank in the Aegean Sea, Greek port authorities said.

Two others remained missing after the accident off the island of Lesbos, they said. Eight people were plucked out of the sea alive.