The joint leader of Turkey's pro-Kurdish party says Turkish forces killed 20 civilians in the city.
The leader of the opposition HDP party condemned the violence.
Ankara says the measure is "short term" as Turkish warplanes pound the PKK positions.
Turkish President Erdogan promised a "decisive" response to the attack.
Turkey faces a snap election this autumn after talks on forming a coalition government broke down.
A far-left group that killed a Turkish security guard in a 2013 suicide bombing of the U.S. embassy claimed it was involved in the latest attack.
Turkey deploys drones and helicopters after outlawed terror group open fire on military convoy.
The price of Turkey's cooperation may be American troops defending the Kurds from the Turks.
The party will be investigated for alleged violations of the constitution, including comments supporting Kurdish militants.
Fighting between Kurds and ISIS in northern Syria is threatening to cross into Turkey.
A radical leftist gunman takes a prosecutor hostage at Istanbul courthouse.
A Kurdish journalist reports on three more days of the Syrian town of Kobane, currently under siege by Islamic State militants
The Turkish foreign minister said that they would help 'peshmerga' fighters reach Kobane, which is under heavy attack from ISIS
At least 12 have died in violent clashes across Turkey as the country's Kurdish minority protests the fate of Kobane
As Islamic State comes knocking on Europe's door, Turkey remains ambivalent to the fighting just across the border
Kurdish activists blocked the entrance to Oxford Circus station in central London demanding greater support for forces fighting Islamic State