Explosion at Istanbul airport puts Turkey on high alert

One woman has been killed and another wounded after an explosion in Istanbul's second international airport.

It has put Turkey on high alert for possible terrorist attacks form Kurdish or Islamic extremists.

Airport cleaner Zehra Yamac, 30, died of head wounds hours after the pre-dawn blast on the tarmac at Sabiha Gokcen airport, Anadolu news agency reported.

Security alert

The explosion took place just outside the terminal building where planes park for their passengers to embark and disembark.

Turkey's private carrier Pegasus Airlines said in a statement the explosion took place next to one of its planes on the tarmac while the two cleaners were nearby.

"There were no passengers either on the plane or on the stairway. Sabiha Gokcen airport is continuing its normal operations," Pegasus said.

The wounded victim, also a cleaner, was hurt in the leg. Yamac was hospitalised but died of her wounds despite the efforts of medical staff, Anatolia said.

The airport said in a statement on its official Twitter account that "flights from our terminals are continuing according to schedule".

Sabiha Gokcen airport, named after Turkey's first female fighter pilot, is the second international airport in Istanbul after much larger Ataturk Airport on the European side of the city.

Sabiha Gokcen hosts flights both to domestic and numerous international destinations often with budget airlines but also from Turkey's flag carrier Turkish Airlines.

"We are working very closely with the Turkish government and our counterparts to facilitate the investigation, and we await their official report on it," Dato' Azmi Murad, the executive director of Sabiha Gokcen said in a statement.

"The Turkish government has heightened security within the vicinity of the airport, which includes helicopter surveillance," he added.

According to Azmi, the airport resumed "normal flight operations" around two hours after the blast.

Tarmac blast

Dogan news agency said that three planes up to 350 metres (1,150 feet) away from the site of the blast had sustained damage.

Police stepped up security at airport entrances after the blast, searching vehicles while a police helicopter circled overhead, Anadolu said.

Turkey is on alert after 103 people were killed on October 10 when two suicide bombers ripped through a crowd of peace activists in the capital Ankara, the worst attack in modern Turkey's history.

That attack was blamed on Islamic State group militants, like two other deadly strikes in the country's Kurdish-dominated southeast earlier in the summer.

Turkish authorities have in recent weeks detained several suspected IS members with officials saying they were planning attacks in Istanbul.

But Turkey is also waging an all-out assault on the outlawed Kurdistan Workers' Party which has staged dozens of deadly attacks against members of the security forces in the southeast of the country.

Meanwhile the banned ultra-left Revolutionary People's Liberation Party–Front has also staged a string of usually small-scale attacks in Istanbul over the last months.