BRUSSELS (AP) — Belgian police used water cannon and tear gas Sunday to disperse some rowdy protesters in Brussels after most demonstrators marched peacefully to protest tightened COVID-19 restrictions that aim to counter a surge of coronavirus infections. Thousands came to reject the new measures announced Friday, the third week in a row that the government has tightened its rules as an avalanche of new cases strains the country’s health services, depriving people with other life-threatening diseases of treatment.…