At least eight Turkish police officers were killed when their bus was blown up by a roadside bomb.
Nine of their colleagues were wounded in the blast, which Turkish authorities suspect could be the work of separatist fighters from the outlawed Kurdistan Workers’ Party (PKK).
It happened in the Karliova district in the east of the country.
The past few months have seen an upsurge in violence between government forces and the PKK.
On Saturday in Hakkari, suspected Kurdish militants killed four Turkish troops.
The government has mounted a major offensive in recent days killing more than 100 separatists.
Turkey, the US and the EU consider the PKK to be terrorists. Its fight for a homeland has cost more than 40,000 lives since 1984.