PORTLAND, Ore. (KOIN) — Portland Police are asking for the public’s help in identifying people who were involved in a protest on Saturday.

Officials say the people they are looking for are believed to be involved in criminal activity.

If you have information, contact Detective Anthony Merrill at Anthony.merrill@portlandoregon.gov or at (503) 823-4033. 

As the protest turned violent Saturday, police said officers saw many people in the crowd with weapons including batons, projectiles and firearms. They also said they got an email stating milkshakes thrown at protesters contained quick-drying cement.

Police said three people were arrested — one in relation to the milkshakes and eight were treated by medics during the demonstrations.