2 deadly shootings within hours in Copenhagen

A man who passed a camera in the area shortly after two suspects had fled in a car following a shooting in Copenhagen, is seen in this police still image taken from video shot February 14, 2015. [Photo/Agencies]

Vilks said after the Paris terror attacks that, due to increased security concerns, even fewer organizations were inviting him to give lectures.

The depiction of the prophet is deemed insulting to many followers of Islam. According to mainstream Islamic tradition, any physical depiction of the Prophet Muhammad - even a respectful one - is considered blasphemous.

While many Muslims have expressed disgust at the deadly assault on the Charlie Hebdo employees, many were also deeply offended by its cartoons lampooning Muhammad.