Police officers arrested five people during a march in Seattle on Saturday night, the Seattle Police Department said in an online post.

The department attributed the arrests made at approximately 10:30 p.m., at 15th Avenue and East Spring Street, to various alleged offenses, including “failure to disperse, pedestrian interference, obstruction and resisting arrest.” Marchers blocked traffic and some spray-painted graffiti, the department alleged.

Shortly after 10:30 p.m., a Twitter user who had been following the march posted video of officers tackling people at the back of a group, saying three arrests had been made in a rush by the police. The Twitter user, independent journalist Alissa Azar, wrote that the incident was unprovoked, with the group marching away.

The Seattle Times didn’t cover the march live and hasn’t independently confirmed SPD’s or Azar’s account.