Turkey's leader calls the blast in Istanbul an attack. At least 6 are dead

At least six people were killed and 53 others injured in an explosion on Istanbul's best-known commercial street, according to Turkey's leader. 

President Recep Tayyip Erdogan described Sunday's blast on Istiklal Avenue as an attack and vowed to identify those responsible for it. 

He said the Turkish nation will not bow to terrorism. 

Five prosecutors were assigned to investigate the explosion, state-run Anadolu news agency said. 

Videos online show bodies lying on the road. Turkey's media watchdog imposed a temporary ban on reporting on the explosion — a move that prevents broadcasters from showing videos of the moment of the blast or its aftermath. 

The Supreme Council of Radio and Television has imposed similar bans in the past, following attacks and accidents. 

Istanbul has been the scene of attacks before. On New Year's Day in 2017, a gunman shot and killed 39 people at a nightclub. Almost 80 others were also injured.