Dozens Injured in Northern Ireland Demonstrations

At least 52 policemen wounded since beginning of pro-British protests

Belfast, Northern Ireland (CNN) -- Petrol bombs, smoke canisters and hurled bricks have injured dozens of police during weeks of violence in Northern Ireland, officials said Sunday.

At least 52 officers have been wounded since pro-British protests erupted in the Northern Ireland city of Belfast last month, police said. Authorities have arrested 70 people in connection with the violence.

Tensions have been high since City Council members there voted a month ago to stop flying the Union Jack flag year-round, restricting it instead to certain days.