Interior Minister Muammer Guler said no-one was injured in the attack on the party headquarters, while a person was wounded in the second assault.

BBC: Turkish capital Ankara hit by twin explosions

The guard who was killed was standing outside the checkpoint, while the two wounded guards "were standing in a more protected area, " said Interior Minister Muammer Guler said.

NPR: Suicide Bomber Kills Guard At US Embassy In Turkey

Turkey's interior minister, Muammer Guler, said law enforcement authorities had information the bomber was a member was a Turkish man in his 30s who had been previously jailed on terrorism charges and was a known member of the outlawed leftist group, the Revolutionary People's Liberation Party-Front, or DHKP-C.

WSJ: Security in Ankara Is Adequate, U.S. Says; Leftist Group Suspected in Blast