(CNN)Demonstrators in Portland, Oregon, on Wednesday vandalized the state Democratic Party headquarters and a federal US Immigration and Customs Enforcement building, according to police. Four people have been charged Thursday in connection with those demonstrations.
Four people charged in Portland after demonstrators vandalized federal ICE building, Democratic Party state headquarters
At least four demonstrations were planned in the city, Sgt. Kevin Allen, spokesman for the Portland Police Bureau, said in a video statement early Thursday.
Two remained peaceful, but the others resulted in "property damage and arrests," he said. CNN is attempting to learn more about who organized the demonstrations.
A group of about 150 people converged on the ICE building in the South Waterfront neighborhood Wednesday evening around 9 p.m., Allen said.
Some demonstrators were carrying pepper ball guns, fireworks, shields, rocks and "electronic control weapons similar to Tasers."
In an updated statement, police said many in the crowd wore gas masks and helmets, and within a few minutes, people began tagging the ICE building with graffiti.
CNN affiliate KOIN reported that the graffiti included messages like, "Reunite families now" -- a possible reference to the separation of migrant children from their parents. There were other messages with an anti-law enforcement sentiment, calling on the abolition of ICE with another anarchy symbol. One message read, "Kill cops!!!"
Federal officials declared it an unlawful assembly after demonstrators started throwing rocks and vandalizing the building, Allen said.
Federal law enforcement officers deployed "crowd control munitions," Allen said, though he did not say what kind, deferring to federal officials. Portland police did not deploy CS gas (commonly referred to as tear gas), Allen added.
CNN affiliate KOIN reported its journalists at the scene saw law enforcement use what appeared to be tear gas, along with stun grenades and pepper balls. Several people appeared to be taken into custody, according to KOIN.
Allen said that police were in the surrounding neighborhood and "some arrests were made."
The city and the ICE building have been the sites of repeated clashes between protesters and federal authorities in recent months. Police did not characterize the makeup of the groups involved in Wednesday's protests.
The demonstration at the ICE building followed another earlier in the day, when a crowd of about 150 people gathered at Revolution Hall before marching to the Oregon state Democratic Party headquarters.
Officers on bicycles encountered the protesters in a parking lot at Revolution Hall, where "(d)ozens of people pressed in on the officers and then took one of the officers' bicycles," Portland Police said in a statement. More officers arrived to help and managed to get the bicycle back. The crowd blocked officers' way as they tried to leave.