Bomb blast near Istanbul subway station injures at least 1

iot police surround the area after an explosion on a highway overpass near a subway station, wounding five people, in Istanbul, Turkey, Tuesday, Dec. 1, 2015.

Riot police surround the area after an explosion on a highway overpass near a subway station, wounding five people, in Istanbul, Turkey, Tuesday, Dec. 1, 2015 (AP)

ANKARA, Turkey -- A local mayor in Istanbul says an explosion on a highway overpass near a subway station was caused by a bomb.

Atilla Aydiner, the mayor for Istanbul's Bayrampasa district, also said five people were wounded in the explosion on Tuesday.

A pipe bomb exploded near the Bayrampasa Metro station in Istanbul during the evening rush hour. pic.twitter.com/JIWWlwhiHn
— Sergio Quintana (@svqjournalist) December 1, 2015

Earlier, Istanbul's governor said one person was slightly injured in the blast and that it might have been caused by a faulty transformer.

The state-run Anadolu Agency said the explosion occurred at an overpass near the city's Bayrampasa station. Several ambulances were sent to the area.

Istanbul Gov. Vasip Sahin said at least one person was slightly injured.

NTV television said six people were injured. The Istanbul mayor's office said subway services in Istanbul were halted on the entire network following the explosion.