Assailants fired a rocket at Prime Minister Recep Tayyip Erdogan's party headquarters and hurled two hand-grenades at the Justice Ministry's parking lot late Tuesday, wounding one person.
The outlawed Revolutionary People's Liberation Party-Front, or DHKP-C, said it carried out the attacks in retaliation for a recent police crackdown on its members, in a statement posted on a website linked to the group.
The statement said the group's "warriors" attacked the two building, accusing Erdogan's government of "injustices." It also threatened more attacks.
Hundreds of members of the group were arrested in a series of police raids in the past two months.A security guard was killed in the group's suicide bombing attack at the U.S. embassy in Ankara last month. DHKP-C has claimed responsibility for assassinations and bombings since the 1970s, but it has been relatively quiet in recent years.
DHKP-C is considered as a terrorist organization by Turkey, the United States andthe European Union.
U.S. Ambassador Francis Riccardonne visited the ruling party's headquarters on Wednesday to express his country's solidarity with Turkey.