Eight Turkish soldiers have been killed in a bomb attack in the southeastern province of Siirt.
The soldiers were killed in an attack on their vehicle by members of the Kurdistan Workers Party, who security officials claimed planted explosives on a highway and detonated them at around 11.10am GMT.
The attack came amid a surge in violence across the mainly Kurdish southeast after the breakdown of a two-year ceasefire last month.
It comes after two armed suspects were detained following a shooting near Istanbul's Dolmabahce Palace.
Terrorists have been blamed for a grenade and gun attack near a major Istanbul tourist attraction.
Turkish officials said two suspects detained near the Dolmabahce Palace were armed with weapons including hand grenades and automatic rifles.
The suspects targeted police officers stationed near the entrance to the Ottoman-era building, according to the Dogan news agency.
The office of Istanbul's governor said a "terrorist group" was behind the attack.
Ambulances were sent to the area around the palace, which also houses the Turkish prime minister's Istanbul offices, but there were no reported casualties.
Roads near the palace, located on the shores of the Bosphorus, were sealed off by police.
Prime Minister Ahmet Davutolgu was in the capital Ankara as reports of the attack emerged.
The US consulate in Turkey has confirmed it will remain closed today following a shootout outside the building this morning.
Embassy officials said no consulate staff were injured in the attack which far-leftist Turkish group the Revolutionary People's Liberation Army-Front has claimed responsibility for.
While the U.S. Consulate in Istanbul is closed today, the U.S. Embassy in Ankara is open for business.
This morning’s security incident in Istanbul resulted in no injuries to Consulate personnel or customers.
Kurdish militants fired on a Turkish military helicopter today, killing one soldier and wounding seven others.
Security sources confirmed the military helicopter had come under fire as it was taking off in the southeastern province of Sirnak.
Four Turkish police officers have been killed in a bomb blast in the the town of Silopi today.
Security sources said another officer had also been seriously wounded in the blast in the largely Kurdish southeastern town.
A female suspect has been detained by police after a shootout outside the US consulate building in Istanbul, according to local broadcaster NTV.
No details have been released about a second suspect, a second woman, who is believed to have taken part in the attack in the city's Sariyer district earlier today.
Two people have reportedly been killed in an explosion at an Istanbul police station.
Istanbul police headquarters confirmed three police officers and seven civilians were also injured during the explosion in the neighbourhood of Sultanbeyli.
Two people were killed and 24 wounded when a suicide bomber detonated a tractor carrying two tonnes of explosive at a gendarmarie outpost in Turkey, Reuters have reported.
The overnight attack in Turkey's eastern province of Agri was carried out by the Kurdish Workers Party, a local government official said.
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Turkish air strikes hit six Kurdish militant targets in Turkey and northern Iraq overnight, a statement from the prime minister's office said.
Turkish authorities have also detained a total of 1,302 people in 39 provinces as part of a crackdown targeting members of Islamic State, the Kurdistan Workers Party (PKK) and illegal leftist groups, the statement said.