Two women - one with a machine gun and the other a pistol - opened fire outside an Istanbul police station this morning. Footage shows a passer-by running away as one assailant shoots at a police bus arriving at the station. The CCTV film shows the other attacker reach into her bag and hurl a hand grenade at the moving vehicle before she fires a handgun.The pair fled the scene to a nearby building, where after a brief stand-off they were killed by riot police. The state-run Anadolu Agency reported the women had been identified as members of the leftist DHKP-C militant group. However, there was no immediate claim of responsibility for Thursday’s attack.