Four killed in knife attack at Paris police headquarters: Report

Investigators suspect a workplace row sparked the deadliest attack on police in France in years

A 45-year-old IT assistant at the police headquarters in central Paris went on a knife rampage inside the building on Thursday, killing three police officers and an administrative worker before he was shot dead by an officer, French officials said.
 

The officials declined to say what the motive was for the attack, which took place at lunch-time, and they said they were still trying to understand if there was a terrorism link.
 

But sources close to the police were quoted by French media as saying that the attacker had a grievance with his managers.
 

Jean-Marc Bailleul, a police union leader,