<sod >He has killed three people Two knives lay on the cobbles in front of Parliament after the attacker was shot by armed police protecting the building PC Palmer was a member of the Parliamentary Diplomatic Protection Command and had served on the force for 15 years.< eod>< sod > He killed four people Two knives lay on the cobbles in front of Parliament after the attacker was shot by armed police protecting the building PC Palmer was a member of the Parliamentary Diplomatic Protection Command and had served on the force for 18 years.< eod>