One person has been killed and another injured in a subway explosion in the Bayrampasa district of Istanbul, local HaberTürk TV reports.
Social media users have posted various photos of people evacuating the subway station, while local media said that trains have been stopped at one of the stations.
The explosion was heard in several districts of Istanbul, residents of the city said on Twitter. Local media reported that fire services and ambulances were sent to the site of the incident.