A speech this week by Pope Benedict XVI has incensed Muslims across the world.
Some Indian Muslims burnt an effigy of the world's Roman Catholic leader who quoted remarks which linked Islam to violence.
Other Indian Muslims joined protest marches.
Pakistani Muslims held rallies at which they asserted that jihad was peaceful.
Palestinian demonstrators expressed their devotion to the Koran during a protest in Gaza City.
Angry protesters in Egypt converged on a Cairo mosque.
In Srinagar in Kashmir, where members of the Muslim League demonstrated, police detained a number of protesters.
In mainly Muslim Pakistan, security forces turned out to guard Roman Catholic churches.
The row is being felt particularly in Turkey which the Pope is due to visit this year.