London police arrested two people on Saturday during an anti-Islam rally in front of City Hall, which saw about 100 people, including rally participants and people staging a counter-protest.

The group that organized rally, Patriots of Canada Against the Islamization of the West (PEGIDA), began the protest at Victoria Park before marching down to City Hall.

Police said they "recognize that a person has fundamental right; these include the freedom of opinion, expression, and peaceful assembly" in a news release.

Far right groups, including PEGIDA, organized a similar rally in front of City Hall last month. Up to 500 people gathered during the two-hour event, which pitted anti-Islam groups against counter-protesters.

Police said the vast majority of the gathering on Saturday remained peaceful. They did not give specific details on why the two people were arrested.

An investigation is ongoing.