The explosion occurred in Yuksekova town in Hakkari province after a funeral for two of the victims killed in Thursday's bombing which blew up a minibus near the remote village of Gecitli in the same province, the official told AFP on condition of anonymity.

Six police officers were among the injured and four of them had serious injuries, he added.

Security forces believe the explosion was the work of the outlawed Kurdistan Workers' Party (PKK) which has been fighting a 26-year campaign for self-rule in Turkey's mainly Kurdish southeast, the official said.

The explosive device, left at a booth that served as a taxi stand, exploded as angry pro-PKK mourners were clashing with police for preventing them from marching along the main street of the town.

During the scuffles, police used water cannon and pepper gas against the protestors who were pelting officers with stones.

Following the explosion, police fired warning shots in the air, dispersing the protestors into side streets.

Turkish officials have blamed Thursday's bomb attack -- one of the bloodiest attacks on civilians in recent years -- on the PKK as well, but the rebels have denied responsibility, in turn blaming the blast on renegade groups within the security forces bent on intimidating the locals.

The fresh unrest comes at a time when the Turkish government is under pressure to reach out to the Kurdish rebels and persuade them into extending a unilateral truce that expires on September 20.

Turkey's main Kurdish party, the Peace and Democracy Party, has urged Ankara to seek dialogue with the PKK for a peaceful solution of the conflict.

Last year, the Turkish government announced a plan to boost Kurdish freedoms in a bid to pressure the PKK into abandoning arms.

But it has ruled out any steps that would jeopardise Turkey's territorial unity and rejected dialogue with the PKK.

The plan has since faltered amid increasing public anger over a series of deadly PKK attacks against security forces since last year.

The PKK, listed as a terrorist group by Turkey and much of the international community, took up arms against Ankara in 1984, sparking a conflict that has claimed around 45,000 lives.