The bombs, placed in front of two shops 500 metres (yards) apart from each other in the centre of the city, went off at 3:00 am (OOOO GMT), blowing out the windows of nearby buildings, the sources said.

It was not clear who had planted the bombs.

Southeastern Turkey has been the scene of a 22-year armed conflict between the Turkish army and the outlawed Kurdistan Workers' Party (PKK), which picked up arms against Ankara in 1984 for Kurdish self-rule in the region.

More than 37,000 people have been killed in the conflict.

Several recent bomb explosions in Turkish cities have been blamed on the PKK and a radical off-shoot since late March, when a week of deadly Kurdish riots rattled urban centers in the southeast.

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