Pipe bomb explodes on overpass near Istanbul metro, 5 hurt: Local mayor

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Explosion Near Istanbul Metro Kills at Least One Person

(Reuters) -- 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.

Turkey has been on high alert since more than 100 people were killed by two suicide bombers in the capital Ankara in October, three months after a similar attack at a town near the Syrian border in July left 33 dead.

See photos from the scene of the bombing:

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Pipe bomb explodes on overpass near Istanbul metro, 5 hurt: Local mayor
Forensic officers work at the site of an explosion on December 1 , 2015 at Bayrampasa district in Istanbul. A station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
Riot police secure the area after an explosion on a highway overpass near a subway station, wounding five people, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The explosion was caused by a bomb left on barriers on the overpass, according to Atilla Aydiner, the mayor for Istanbul's Bayrampasa district.(AP Photo/Cagdas Erdogan)
ISTANBUL, TURKEY - DECEMBER 1 : Turkish police officers stand guard around Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images)
ISTANBUL, TURKEY - DECEMBER 1 : Turkish crime scene investigation team inspect the blast site around Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images)
Riot police arrive after an explosion on a highway overpass near a subway station, wounded five people and was caused by a bomb according to information given by the local mayor, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The bomb was left on barriers on the overpass, said Atilla Aydiner, the mayor for Istanbul's Bayrampasa district.(AP Photo/Cagdas Erdogan)
A police forensic officer secures the area after an explosion on a nearby highway overpass near a subway station wounded five people and was caused by a bomb, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The bomb was left on barriers on the overpass, said Atilla Aydiner, the mayor for Istanbul's Bayrampasa district.(AP Photo/Cagdas Erdogan)
Riot police secure the area after an explosion on a highway overpass near a subway station, wounding five people, in Istanbul, Turkey, Tuesday, Dec. 1, 2015. The explosion was caused by a bomb left on barriers on the overpass, according to Atilla Aydiner, the mayor for Istanbul's Bayrampasa district.(AP Photo/Cagdas Erdogan)
ISTANBUL, TURKEY - DECEMBER 1 : Turkish police officers stand guard around Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images)
Turkish riot policemen guard the site of an explosion on December 1, 2015 at Bayrampasa district in Istanbul. A station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / CAGDAS ERDOGAN (Photo credit should read CAGDAS ERDOGAN/AFP/Getty Images)
ISTANBUL, TURKEY - DECEMBER 1 : People wait outside the Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images)
ISTANBUL, TURKEY - DECEMBER 1 : People wait outside the Bayrampasa Metro Station after a blast occurred at an intersection in Bayrampasa district on the European in Istanbul, Turkey on December 1, 2015. (Photo by Isa Terli/Anadolu Agency/Getty Images)
Forensic officers work at the site of an explosion on December 1 , 2015 at Bayrampasa district in Istanbul. A station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / STR (Photo credit should read STR/AFP/Getty Images)
A metro passes as forensic officers work at the site of an explosion on December 1 , 2015 at Bayrampasa district in Istanbul. A station on the Istanbul metro was on December 1 rocked by a blast suspected to have been caused by a home-made bomb, causing panic in the evening rush hour and wounding up to half a dozen people. / AFP / OZAN KOSE (Photo credit should read OZAN KOSE/AFP/Getty Images)
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Tuesday's blast near the Bayrampasa metro station came at the height of the evening rush hour, district Mayor Atilla Aydiner told A Haber television. Bayrampasa is a residential and industrial area on the European side of Istanbul.

Another broadcaster earlier reported that one person had been killed but Aydiner confirmed only five injuries.

Grainy CCTV footage showed a large flash of light on the overpass followed by what appeared to be burning embers showering to the ground as cars drove below.

Photographs on social media showed what appeared to be dozens of people walking alongside overground train tracks after trains had been halted. Although Istanbul's metro is largely underground, it runs above ground in some places, including around Bayrampasa.

Tuesday's blast was much smaller than the ones in Ankara and the town of Suruc near the Syrian border, which are believed to have been carried out by Islamic State militants.

Turkey, a NATO member, has carried out air strikes against the Islamist insurgents in neighboring Syria as part of the U.S.-led coalition fighting the jihadist movement.

It also faces security threats from the outlawed Kurdistan Workers Party (PKK), whose militants often attack police and security in Turkey's mainly Kurdish southeast, and the far-left Revolutionary People's Liberation Army-Front (DHKP-C).

The DHKP-C, which is considered a terrorist organization by the United States and Ankara, said that one of its members was involved in an attack on the U.S. consulate in August.

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