It came through on my news wires and it was stated by Sky. But yeah best to wait.
Yes, it appeared on mine as well, and it was even relayed by a Police union (we have those), but it appears to be false... After the last events, I learned to stick to the official informations given by the Ministry and the Police, as they improved their communications as well.
So, to sum things up, from official (Police and Home Office) French speaking sources: what appears to be a terrorist attack happened on Champs Élysées tonight. A man armed with an automatic weapon shot a policeman while getting out of his car, and ran toward other police officers, who shot him in return. One policeman is dead, and two others are seriously wounded. The assailant is dead, and his car is searched for explosives and clues. There may be some accomplices, but we don't know yet. The "Attorney General" treats this case as terrorism until proven otherwise.