Four radio station employees who engineered an on-air stunt involving barging into a mosque and blaring the national anthem have been charged with misdemeanors, but Muslim leaders say they want more serious penalties.

The authorities said Joey Teehan, a producer for KBPI radio, and William Jones, a sound engineer, walked into the Colorado Islamic Center on Tuesday playing "The Star-Spangled Banner" on a trumpet and bugle.

Mr. Teehan wore a turban and a T-shirt depicting Mahmoud Abdul-Rauf, the Denver Nuggets basketball star who recently refused to stand during the pre-game national anthem.

Mr. Teehan and Mr. Jones were charged on Friday with unlawful conduct on public property and disorderly conduct with unreasonable noise in a public place.