An explosion killed at least 27 people and wounded 75 others on Sunday in the Turkish capital of Ankara, according to the Associated Press, which cited the Ankara goveor's office.

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Members of emergency services work at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. A television chael said the bomb exploded close to bus stops near a park at Ankara's main square, Kizilay. The news chael said the explosion occurred as a car slammed into a bus, suggesting that the blast may have been caused by a car bomb. Several vehicles had caught fire, it said. (AP Photo)Expand / Contract

Members of emergency services work at the scene of an explosion in Ankara. (AP)

The blast originated from an "explosive-laden vehicle," according to the Ankara goveor's office, and Turkish broadcaster TRT reported a car exploded near a bus stop.

Prime Minister Ahmet Davutoglu was convening an emergency security meeting.

A Turkish security official told Reuters that a Kurdish militant group likely carried out the attack.

"According to initial findings, it seems that this attack has been carried out either by the PKK or an affiliated organisation," the official said.

The wounded were taken to 10 hospitals in the city, and a dozen of the injured were in very serious condition, according to AFP, citing medical sources.

Related Image

Members of emergency services work at the scene of an explosion in Ankara, Turkey, Sunday, March 13, 2016. A television chael said the bomb exploded close to bus stops near a park at Ankara's main square, Kizilay. The news chael said the explosion occurred as a car slammed into a bus, suggesting that the blast may have been caused by a car bomb. Several vehicles had caught fire, it said. (AP Photo)Expand / Contract

The aftermath of an explosion in Ankara that occurred near a bus stop. (AP)

Gunfire was heard after the explosion, officials told Reuters. Ambulances rushed to the area and smoke could be seen rising from about two miles away, a witness told Reuters. Several cars were seen on fire.

The blast occurred on the city's main boulevard, Ataturk Bulvari, close to Ankara's main square, Kizilay. It happened adjacent to bus stops near a park.

Dogan Asik, 28, said he was on a bus when the explosion occurred.

"We were thrown further back into the bus from the force of the explosion," said Asik, who sustained injuries on his face and arm.

Police sealed off the area and pushed onlookers and joualists back, waing there could be a second bomb.

The explosion comes less than a month after a bomb killed 29 in Ankara. Kurdish militants took responsibility for that blast.

The blast also occurred two days after the U.S. Embassy issued a security waing about a potential plot to attack Turkish govement buildings and housing in one Ankara neighborhood and asked its citizens to avoid those areas.

The Associated Press contributed to this report.