Bayrampasa Metro Station

Five people were injured when a pipe bomb exploded on an overpass near an Istanbul metro station on Tuesday, the district mayor said, halting some train operations and heightening security fears in Europe's biggest city.

One person was killed after an explosion at an Istanbul subway station that was apparently triggered by a power transformer today, Turkey's Haberturk TV said.

Five people were injured when a pipe bomb exploded on an overpass near an Istanbul metro station on Tuesday, the district mayor said, halting some train operations and heightening security fears in Europe's biggest city.

One person was killed after an explosion at an Istanbul subway station that was apparently triggered by a power transformer today, Turkey's Haberturk TV said.