Turkey, a growing travel destination in recent years, has been a repeat terrorist target in recent months. Before you book that Turkish trip – or cancel it — consider these five points.

The U.S. State Department is increasingly nervous. On Feb. 4, the agency warned Americans against travel to southeastern Turkey because of “an increased threat of terrorist attacks,” perhaps from an international terror organization, perhaps from an indigenous one.

But not all the trouble is confined to the southeastern area near the Syrian border. On Jan. 12 in Istanbul, a killer in his 20s with Islamic State ties detonated a bomb-rigged vest, killing 10 German tourists and himself at one of the city’s busiest tourist spots, the Sultanahmet District. That area, which includes the Blue Mosque and the Hagia Sophia, is basically ground zero for travelers in a city famed for its position straddling Europe and Asia.

Turkish officials have said that the bomber had entered the country as a Syrian refugee. His attack followed multiple terrorist killings last year, including an Oct. 10 bombing in Ankara that killed more than 100. On Jan. 14, just two days after the Istanbul bombing, came a car-bomb-and-gunfire attack on a police headquarters in Turkey’s southeastern Diyarbakir Province, killing another five people or more. Government officials blamed that attack on Kurdish separatist terrorists, whose history of clashes with Turkish government troops is long and bloody.

Despite a slowdown at the end of the year, American travel to Turkey was up in 2015.

Turkish government figures show 798,787 Americans visited the country in 2015, up 1.8% from the year before.