(CNN) -- Four people were arrested Wednesday in connection with blasts in a southern Turkish town that killed about 50 people, the semi-official Anadolu news agency reported.
The arrests were tied to Saturday's bloodshed in Reyhanli, where two explosive-laden cars went off at the community's city hall and in front of a post office.
In addition to those killed, about 100 people were injured in the blasts.
By Monday, nine suspects -- all of them Turkish nationals -- were in custody, Interior Minister Muammer Guler told Anadolu. He and other Turkish officials accused a former Marxist terror group that they say maintains relations with Al Muhabarat, Syria's intelligence services.
Wednesday's Anadolu report said four other individuals were questioned about the bombings by prosecutors and then released.