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(Image: AFP/GETTY)

More than 250 people have been killed in Turkey in just one year in a series of bomb and gun attacks.

At least 36 people were killed and 147 injured in the latest assault, on Ataturk Airport in Istanbul on Tuesday evening.

Britain's Foreign Office has warned tourists the terror threat is "high", to be vigilant and to avoid certain areas.

(Image: REUTERS)

Turkey – which borders Islamic State heartland in Syria – faces the twin threat of ISIS and Kurdish militant group the PKK.

It has suffered a spate of bombings this year – including two suicide attacks in tourist areas of Istanbul blamed on Daesh and two car bombings in the capital, Ankara – which were claimed by the PKK.

In the most recent attack, a car bomb ripped through a police bus in central Istanbul during the morning rush hour, killing 11 people and wounding 36 near the main tourist district, a major university and the mayor's office.

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(Image: AFP/GETTY)

One person was killed in December when an explosion hit Istanbul's second airport, Sabiha Gokcen – located on the Asian side of the city.

That attack was claimed by the PKK.

More than 100 people were killed when ISIS targeted a peace rally in Ankara last October.

Another 34 were slaughtered in an attack on the capital in March.