"I was working with Guillem Gervilla, parliamentary adviser to Eric Dupond-Moretti, when all of a sudden we heard a horde of people heading towards the office and then banging on the windows," Grau told AFP. , estimating their number at more than 250.
"We went out to talk to them and there we were taken to task very violently. They clearly wanted to crack us down with some pretty heavy insults," he added.
"One of my neighbors intervened and got slapped. I received a punch on the chin," said the deputy.
"We finally managed to sneak upstairs and they dispersed after breaking a window," he said.
Romain Grau announced his desire to file a complaint on Sunday.
The Ministry of the Interior counted nearly 38,000 demonstrators across France on Saturday against the vaccination pass, two days before it came into force.
On Wednesday, the Paris prosecutor's office opened an investigation for "aggravated intentional violence" after the January 15 attack on a team of AFP journalists covering an anti-pass rally.
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