One of Paris' busiest tourist areas turned into a nightmare zone on Thursday,... as four people were brutally stabbed to death in the French capital's police headquarters.<br />Police say a 45-year-old IT assistant went on a knife rampage inside the building, killing three officers and an administrator.<br />Three of the victims were men, one was a woman.<br />The attacker was eventually shot dead by an officer.<br />Police didn't immediately specify the motive, but investigators told reporters it may have been sparked by a personal conflict.<br />
