A car bomb apparently targeting the military killed four people and wounded dozens today in the Kurdish-dominated Turkish city of Diyarbakir.
A bus transporting military personnel was passing by a five-star hotel when the bomb exploded.
Some 52 people wounded in the blast, Prime Minister Recep Tayyip Erdogan said.
Authorities blamed the blast on Kurdish rebels. Police were searching for two suspected Kurdish militants.
The attack — which shattered the windows of surrounding buildings — appeared to be a retaliation to three airstrikes by Turkish warplanes against Kurdish rebel shelters in northern Iraq last month.
Rebels from the Kurdistan Workers Party, or PKK, have battled for autonomy in south-eastern Turkey for more than two decades resulting in tens of thousands of deaths.
The group uses strongholds in northern Iraq for cross-border strikes. In October, Parliament authorised Turkey's military to strike back at rebels across the border.