Nearly a third of people on a French terror watchlist are believed to have psychiatric disorders, Interior Minister Gerard Collomb said Tuesday, a day after a mentally ill man went on a rampage in a stolen van in Marseille. The incident, in which the man drove into two bus shelters, killing one person and seriously injuring another, immediately drew comparisons with a string of attacks across Europe in which vehicles have been used as killing machines.

But investigators said there was no evidence of any terror links, saying the 35-year-old French driver who had a book about philosophy and another about Islam in the car, had "psychological" problems. The attack is one of a handful in the past month in France in which men suffering from mental illnesses have apparently mimicked jihadist assaults.

Collomb said that of the around 17,400 people flagged by the intelligence services as radicals one third were believed to be mentally ill. The minister said he would enlist the help of psychiatric hospitals in identifying patients who represented a potential threat.

"The medical secret is sacred of course but at the same time we must find a way to avoid a certain number of individuals suffering from serious disorders carrying out attacks," he told BFMTV news channel. Terrorism experts have long warned that the intense media coverage of jihadist violence could spur copycat attacks by mentally unstable individuals with a propensity for violence.

Copyright Agence France-Presse, 2017