The office for the local governor said the device was believed to have been planted by fighters from the Kurdistan Workers Party (PKK), but this has not been independently verified.
In a statement the office said that none of the injured were in a life-threatening condition.
A security operation has been launched by the army in the area.
The PKK, which has laid similar devices in the past, has been fighting for autonomy in southeast Turkey for 25 years, in a conflict that has claimed the lives of at least 40,000 people .
Last month, the PKK announced that it was extending a ceasefire in its armed campaign until July 15 in response to progress towards a peaceful resolution to the conflict.
The group cautioned, however, that it would defend itself if its members came under attack from the Turkish military.
The PKK is considered a terrorist organisation by Turkey, the European Union and the US.