Police took about a dozen people into custody Wednesday evening as scuffles broke out during a flag-burning protest in the streets outside the Republican National Convention.

It was the most turbulent protest since the four-day convention began on Monday. The chaos briefly prevented delegates and members of the media from getting into the Quicken Loans Arena for the night’s proceedings.

Lt. Michael Butler said 10 to 16 people were taken into custody and would be charged.

Two officers were assaulted and suffered minor injuries, police said. One officer was seen bleeding from his elbow.