Hundreds of youths gathered to protest against the cartoons of the Prophet Muhammad , defying a ban.
Police sealed off the centre of Islamabad to guard against the protests taking place.
Protesters took out their anger on the security forces by throwing stones.
Tear gas shells were used to disperse demonstrators who had gathered to voice objections to the cartoons.
Rubber bullets were also used by police, who in turn were pelted with stones.
The cartoons, first printed in a Danish magazine, have angered Muslims across the world.