An explosion targeting Turkish military buses carrying persoel killed at least 28 people and wounded 61 others in the capital city of Ankara Wednesday, in what govement officials called an intricately plaed act of terror.
The U.S. Embassy in Ankara activated "duck and cover" following the nearby explosion, a U.S. govement source told Fox News.
Officials condemned the attack as "contemptible and dastardly" but did not state how many of the dead or wounded were members of the military. They said the vehicles were attacked as they stopped at traffic lights.
It was not clear who was behind the bombing. Kurdish rebels, the Islamic State group and a leftist extremist group have carried out attacks in the country recently.
The explosion, believed to be a car bomb, occurred at the height of the evening rush hour in an area some 328 yards away from military headquarters, goveor Mehmet Kilicer said. The blast caused a large fire and dark smoke could be seen billowing from a distance.
Amb. Bass: Deeply saddened, shocked by terror attack in Ankara. Our hearts and prayers go out to those affected.
— US Embassy Turkey (@USEmbassyTurkey) February 17, 2016
Turkey's prime minister Ahmet Davutoglu canceled a plaed visit to Brussels in order to attend a security meeting with President Recep Tayyip Erdogan and other officials.
In October, suicide bombings blamed on ISIS targeted a peace rally outside the main train station in Ankara, killing 102 people in Turkey's deadliest attack in years.
Wednesday's attack comes at a tense time when the Turkish govement is facing an array of challenges. A fragile peace process with the Kurdish rebels collapsed in the summer. The Turkish security forces have been engaged in large-scale operations against Kurdish militants in the southeast since December, imposing controversial curfews in flashpoint areas, and the fighting has displaced tens of thousands of civilians.
Turkey has also been helping efforts led by the United States to fight ISIS in neighboring Syria, and has faced several deadly bombings in the last year that were blamed on that terror group.
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Witnesses reacting to the explosion in Ankara. (IHA via AP)
The Syrian war, meanwhile, is raging along Turkey's southe border. Recent airstrikes by Russian and Syrian forces have prompted tens of thousands of Syrian refugees to flee to Turkey's border. Turkey so far has refused to let them in, despite being urged to do so by the United Nations and European nations, but is sending aid to Syrian refugee camps right across the border.
Turkey, which is already home to 2.5 million Syrian refugees, has also been a key focus of European Union efforts to halt the biggest flow of refugees to the continent since World War II. Hundreds, sometimes thousands, of refugees leave every night from Turkey to cross the sea to Greece in smugglers' boats.
Fox News' Kara Rowland and The Associated Press contributed to this report.