What we know so far Will trade racists for refugees shirt .a policeman has been stabbed and his apparent attacker shot by officers in a major security incident at the  houses of Parliament. around three shots rang out outside the palace of Westminster after a man ran through the gates into the front yard of the  parliamentary compound apparently waving a knife. Two people were seen being treated on the ground in new palace yard amid shouts and screams. An air ambulance landed in Parliament Square and a regular ambulance came in through the front gates as medics rushed to help the injured people. Armed police cleared the area around the incident and Parliament Square was closed to traffic. police have confirmed people were killed including a police officer.