WASHINGTON: Police arrested more than a dozen people who crossed a barricade and blocked entrances at the Internal Revenue Service (IRS) building here yesterday, at the start of a day of protests marking the fifth anniversary of the US invasion of Iraq.

A crowd of more than 100 gathered outside the IRS headquarters, chanting, "This is a crime scene" and, "You're arresting the wrong people."

A marching band led protesters down the street near the National Mall and around the IRS building before dozens of demonstrators gathered at the entrance.