Diyarbakir: A Turkish driver was killed and four soldiers injured when Kurdish guerrillas opened fire on a convoy of vehicles in southeast Turkey on Thursday, a security source said.

The source, who declined to be named, said Kurdistan Workers Party (PKK) rebels opened fire on the convoy of civilian minibuses bringing soldiers back from an operation in the restive southeast.

The army responded with a fresh operation against the guerrillas in the provinces of Diyarbakir and neighbouring Bingol.

Some 40,000 people have been killed in the conflict since the PKK launched its armed insurgency against the Turkish state in 1984 with the aim of establishing a Kurdish homeland in the southeast of the country.

The PKK is considered a terrorist organisation by the United States, Turkey and the European Union.