Several hundred Jordanians rallied for political reforms in the capital, Amman, on Friday.
Some burned an American flag to protest against what they called U.S. interference in their reformist movement.
Others denounced what they said were attacks on freedom of the press. Last week, several journalists were among those injured after police with batons moved in on anti-government demonstrators in Amman.
On Thursday, King Abdullah said the police attack on journalists was unjustified. Earlier in the week, Jordan announced the arrests of four police officers in connection to the incident.
In June, King Abdullah announced some concessions in an apparent bid to meet the demands of demonstrators.
He said he would pursue reforms that would allow the formation of future governments that were based on an elected parliamentary majority.