Paris police says they've made eight arrests after demonstrators protesting the government's labor reforms went on a rampage across the capital, attacking a police building, damaging cars and vandalizing bank offices.

The protesters tried in vain in the early hours of Sunday to get to the residence of French Prime Minister Manuel Valls, who is on a trip to Algeria.

Police said later that the rioters consisted of about 300 people who came from a sit-in at Paris' Place de la Republique but it's not clear whether they had any affiliation to the loose-knit so-called "Night Rising" group there.

Police said the situation at the sit-in, which is ongoing, is now calm.

Saturday saw scores of rallies and demonstrations across France in opposition to the labor reforms.