Security cordon surrounds police HQ after fatal attack A man wielding a knife stabbed and killed four officers at the police headquarters in the heart of central Paris on Thursday, before being shot dead.\\n\\nThe premises were cordoned off after the lunchtime attack in the historic centre of Paris, usually thronged with tourists, and a dozens of police and emergency vehicles had converged at the scene, AFP journalists reported.\\n\\n(COMPLETES VIDEO 1L10M3) IMAGES of the security cordon around the Paris Police HQ