Istanbul - Seven people were killed in two shootings at courthouses in Istanbul and the northern Turkish province of Tokat yesterday.In Istanbul, a man shot his mother, a policeman guarding her and a security guard at the Çağlayan courthouse. Hanime Arslan, 43, was at the courthouse for a lawsuit against her former husband she accused of threatening her. As she was about to enter the courthouse with a policeman assigned to protect her, the suspect, later revealed to be her son Dursun Zeyir, 20, fired shots. Arslan and the policeman were killed while a security guard at the courthouse was injured. Zeyir was captured by the police at the courthouse.In Tokat, five people in a parked car were shot dead by two gunmen in the courtyard of a courthouse. Suspects surrendered to the police after the killings. Turkish police officials said victims and suspects were relatives of defendants and plaintiffs in a trial on a 2012 murder and yesterday's killings were an act of revenge.