People protested in front of the Palais de Congres, in Montreal, Saturday, Feb. 9, 2013. (JOEL LEMAY/QMI Agency)

MONTREAL -- Different government, same protests.

Police said they arrested 36 people at a morning protest on Saturday outside the city's downtown convention centre. There were no reports of serious injuries.

Protesters outside the centre shouted "Charest, Marois, same fight!" citing their displeasure with both the Charest Liberals and the Parti Quebecois government of Pauline Marois, with regards to the province's northern development plans.

Montreal's Board of Trade hosted a two-day trade show on resource development in the province's northern territories at the convention centre. The show, which ended Saturday, hosted big names in the resource-extraction industry including Rio Tinto Alcan, Enbridge and SNC-Lavalin.

A few hundred people gathered outside the centre starting around 9:30 a.m. Shorty after, police declared the protest illegal. Police said protesters started committing acts of vandalism and didn't provide police with a route prior to the gathering, as per municipal law.

Police spokeswoman Anie Lemieux said that of the 36 arrested, nine were minors. Lemieux said police arrested four people for criminal acts, including assault on a police officer. The rest were arrested for illegal assembly, she said.