A Pakistani cleric offered a 1.5 million rupee (€28,000) reward and a car for anyone who kills the cartoonist who drew Prophet Mohammed.
Another Islamist leader was put under house detention, amid fears of more deadly demonstrations today, officials said.
The cleric did not name the cartoonist, and several cartoonists submitted images to the Danish newspaper Jyllands-Posten, which first published them.
Thousands of security forces were deployed across Pakistan to prevent unrest.
Police arrested 125 protesters for violating a ban on rallies in eastern Pakistan and arrested 30 others after firing tear gas to disperse a protest in the southern city of Karachi.