BOSTON (AP) — The daughter of U.S. Rep. Katherine Clark from Massachusetts was taken into custody during a Saturday night protest Boston Common. Later, he was charged with assault when a officer injured.

a statement on its websiteThe Boston Police Department reported that the 23 year-old suspect was scheduled to appear in court Boston Municipal Court.

Clark, House Democratic whip, stated in a tweet Riley Dowell was Riley’s daughter. “I love Riley, and this is a very difficult time in the cycle of joy and pain in parenting,” Clark wrote. “This will be evaluated by the legal system, and I am confident in that process.”

Clark spoke out publicly about her fear of having a nonbinary child in the face of bigotry towards transgender individuals.

According to police, officers responded at Parkman Bandstand Monument in the vicinity of the Boston Common. Police say they discovered Dowell in Melrose who had defaced the monument using spray paint and antipolitical phrases.

During Arrest “a group of about 20 protesters began to surround officers while screaming profanities though megaphones on the public street causing traffic to come to a standstill,” Police added that “an officer was hit in the face and could be seen bleeding from the nose and mouth.”

Police said Dowell was facing charges of assault using a deadly weapon, injury or destruction to property and property damage by graffiti/tagging.

An earlier police shooting in Cambridge, Massachusetts resulted in protests about the excessive use of force. The University of Massachusetts student, 20 years old BostonCambridge police shot and killed Sayed Faisal. Police described him as carrying a knife called a kukri (a type of blade) and was threatening officers. “sponge round” He was not able to be stopped, according to police.

Clark is in her sixth term in the House and represents the state’s 5th Congressional District.