A deadly “terror” attack targeted a Turkish aerospace company in the capital Ankara, government officials said Wednesday.

Attackers set off explosives and opened fire Wednesday at Turkey’s state-run aerospace and defense company TUSAS, killing four people and wounding more than a dozen

It was not clear who may be behind the attack. Kurdish militants, the Islamic State group and leftist extremists have carried out attacks in the country in the past

Interior Minister Ali Yerlikaya said two attackers were killed in the attack, adding three of the injured are in critical condition. TV broadcasters showed footage of armed assailants entering the TUSAS building.

The cause of the explosion and the subsequent gunfire remained unclear, with some media reports claiming a suicide attack had occurred. Emergency services were dispatched to the site, Anadolu reported.

A man and a woman wielding automatic weapons opened fire on staff at the headquarters of a Turkish aerospace company on Wednesday in a deadly terror attack.

An attack at Turkish Aerospace Industries' headquarters near Ankara resulted in four deaths and 14 injuries. Two attackers were killed, and authorities termed it a terrorist act. Investigations are ongoing as no group has claimed responsibility.

A series of explosions and gunshots were heard at TUSAS, Turkey’s state-run aerospace and defense company, in an attack Turkey’s defense chief blamed on the outlawed Kurdistan Workers Party.

Five people have been killed and 14 wounded in an attack on an aerospace firm near the Turkish capital of Ankara, the government said. Two attackers - a man and a woman - were killed in the skirmish after witnesses heard gunfire and an explosion at the site, interior minister Ali Yerlikaya said.

Attackers set off explosives and opened fire Wednesday at Turkey's state-run aerospace and defense company TUSAS, killing four people and wounding more than a dozen, President Recep Tayyip Erdogan said.