A gunman killed at least four people and wounded 11 others near a Christmas market in the French border city of Strasbourg on Tuesday evening before being cornered by police, Reuters reports.

The motive was not immediately clear but, with France still on high alert after a wave of attacks commissioned or inspired by Islamic State militants since early 2015, the counter-terrorism prosecutor opened an investigation.

Some two hours after the attack, elite police cornered the suspect and shots were fired, a source close to the operation said. French media reported the assailant was holed up in a store on the Rue Epinal.

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