Update: Suspected radical kills mother and sister in attack near Paris

Update: A man flagged by French authorities as a suspected radical has killed his mother and sister and seriously injured another woman in a knife attack that was quickly claimed by Islamic State.

Update - 11.55am: A man flagged by French authorities as a suspected radical has killed his mother and sister and seriously injured another woman in a knife attack that was quickly claimed by Islamic State.

Police shot and killed the man, whose motives were not immediately clear.