Rocket attacks hit the Istanbul police headquarters and the ruling Justice and Development (AK) Party's local headquarters in Istanbul on Friday.
Unidentified assailants first targeted the police headquarters in the Fatih district of Istanbul, and hours later a second attack hit AK Party's İstanbul branch office in the Sütlüce neighborhood of Eyüp district later Friday.
Istanbul Governor Vasip Şahin said on Twitter that the first attack was carried with a light anti-armor weapon (LAW) but had failed, and no one was hurt in the attack. He also said an operation was under way to catch the attackers.
AK Party Provincial head Selim Temurci said on Twitter that there were no injuries in the attack on the party's office.
Later, speaking to reporters, Temurci said the rocket pierced the wall of the building but did not explode, and pointed to the involvement of ultra-left Revolutionary People's Liberation Party-Front (DHKP-C).
He said two assailants were involved in the attack.
Earlier, Prime Minister Binali Yıldırım said that terror groups carried out the attack on Istanbul police headquarters.
President Recep Tayyip Erdogan was briefed by Temurci and the governor.