(CNN) -- At least 27 police officers were injured in clashes overnight in Belfast, Northern Ireland, including three hit by shotgun pellets, police said Monday.
About 200 people rushed into the streets around 11:45 p.m. Sunday (7:45 p.m. ET), with some throwing objects and explosives, police said.
The injuries are not thought to be serious, police spokesman John Anderson said.
The violence took place in two different parts of the city on the eve of a holiday often marked by tension between Catholics and Protestants.
