STOCKHOLM: The Swedish artist who created a blasphemous sketch of Prophet Mohammad (PBUH) has been pelted with eggs by a group of people during a university lecture on the limits of the freedom of expression.

According to a police statement, Lars Vilks was unharmed in the attack that occurred at Karlstad University in southwestern Sweden late Tuesday evening.

No one has yet been arrested for the assault, but police say they are investigating the incident.

The 65-year old artist has faced a string of threats over his 2007 sketch, which rekindled a debate over free speech and Islam that had raged a year earlier after a Danish newspaper printed 12 cartoons of Mohammad (PBUH).