(File photo)

PARIS, May 1 (Xinhua) -- Two riot policemen were wounded after protestors participating at May Day rally in Paris hurled projectiles and Molotov cocktails, Paris prefecture said on Monday.

On its twitter account, the prefecture wrote "masked individuals threw projectiles and Molotov cocktails at police. Two riot policemen injured."

In a context of high terror risk, 9,000 policemen, gendarmes and soldiers were mobilized on Monday with 2,000 of them deployed to secure protests in the French capital, it added.

According to news channel BFMTV, three policemen were wounded with one of them in serious condition following a clash erupted on the rally sidelines.

One person was arrested after 150 masked people attacked riot police, who replied by using tear gas, according to local media reports.