The Daily Telegraph's Paris Correspondent Henry Samuel has tweeted:
Toulouse gunman, 26, mentally ill and without medication. Sister: "He was put in care very young, is angry and scared of the outside world".
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Commuters were also warned to expect travel chaos as Doris gathered speeds of nearly 90mph.
A man with 62 penalty points on his licence is among thousands of motorists allowed to drive despite exceeding the limit warranting a ban.
Storm Doris is set to bring severe weather across much of the UK on Thursday as heavy rain and strong winds push in from the west.