A person working in a vaccination centre in the Grand Est region in France was violently assaulted on Friday.

On Friday, an employee of the vaccination centre in Munster (Haut-Rhin) was "violently attacked" by three people, the Haut-Rhin district and the Grand Est regional health agency (ARS) announced on Saturday.

The prosecutor of the Republic of Colmar, Catherine Sorita-Minard, announced on Saturday that she had opened an investigation for "violence with a weapon and premeditation" and that the investigation had been entrusted to the Gendarmerie of Colmar, which will now investigate the attackers and possible motives.

The incident occurred at around 8pm on Friday during the closure of the vaccination centre, the prosecutor said, adding that the victim was not in a serious condition.

The Haut-Rhin district and the director general of ARS Grand Est have condemned the incident as an "unacceptable act". "Nothing can justify such violence," they said in a joint statement.

A psychological unit would be set up "if necessary".

The vaccination centres were "the subject of constant attention" by the police. "This mobilisation will continue," they warned.