A blade using representative has slaughtered three officials and one managerial laborer at police central command in the focal point of the French capital, Paris.
The aggressor, who has not been named, was shot dead by police.
Witnesses portrayed scenes of frenzy, with numerous individuals escaping the structure in tears. The territory in the île de la Cité was closed.
The assault came a day after police took to the streets crosswise over France over expanding viciousness towards officials.
The Paris investigator said a homicide examination had been propelled.
Paris blade assault: Latest pictures from the scene
A rationale in the assault stays hazy. In any case, police association authorities have proposed the aggressor may have been engaged with a working environment question.