At least four people have been killed in two separate shootings in the Turkish capital Ankara. In the first incident a policeman shot dead his female colleague in the city’s Dickman neighborhood. In the second event, a man shot two of his close relatives dead before turning the gun on himself. The Turkish capital has been on edge since last week’s deadly bomb blast which left at least 37 people dead. Meanwhile, in the restive southeast regions, a police vehicle came under a bomb attack in the town of Nusaybin. There are no further details about the casualties of the incident. The Turkish government has blamed the recent wave of attacks on security forces on the militants from Kurdistan Workers’ party, the PKK.