At least five people were killed and 22 others injured in an attack on the headquarters of a top Turkish defence firm near the country's capital Ankara on Wednesday.
The two attackers, a woman and a man, now "neutralised", were allegedly seen on camera carrying out the deadly attack at the Turkish Aerospace Industries (TAI), located some 40 kilometres north of Ankara.
An unconfirmed report by private channel NTV said a "group of terrorists" had burst into the building, one of whom "blew himself up". Some news outlets reported exchanges of fire for over an hour.
Media reports also said that the attackers killed the cab driver before taking his vehicle to carry out the attack. Turkey's vice president Cevdet Yilmaz said four of the victims were TAI employees while the fifth was a taxi driver.
"The way in which this action was carried out is very probably linked to the PKK (Kurdistan Workers' Party)," he said, referring to the group involved in decades-long insurgency against the Turkish state.
President Recep Tayyip Erdogan, who was in Russia for talks with Vladimir Putin, called it a "heinous" attack on Turkey's defence industry.