Photos: Blast in Turkish capital of Ankara Police work at the site of an explosion in Ankara, Turkey, on Sunday, March 13. The blast killed at least 27 people and wounded at least 75 others, the governor of Ankara said in a written statement. Hide Caption 1 of 9

Photos: Blast in Turkish capital of Ankara Medics carry an injured person at the explosion site. Hide Caption 2 of 9

Photos: Blast in Turkish capital of Ankara Scores of police cars, firefighters and medical personnel rushed to the scene. The cause is still unknown. Hide Caption 3 of 9

Photos: Blast in Turkish capital of Ankara Members of emergency services work at the scene. Hide Caption 4 of 9

Photos: Blast in Turkish capital of Ankara A police officer looks on as a body bag is carried at the scene of the explosion. Hide Caption 5 of 9

Photos: Blast in Turkish capital of Ankara Large numbers of emergency workers gather at the scene. Hide Caption 6 of 9

Photos: Blast in Turkish capital of Ankara Turkish police take security measures after the explosion. Hide Caption 7 of 9

Photos: Blast in Turkish capital of Ankara An ambulance arrives near the scene. Hide Caption 8 of 9