Dozens of protesters forced their way into an Ontario theme park on Sunday, railing against the fact it has marine life in captivity.

A crowd that police pegged at about 800 gathered outside Marineland and later about 150 of them broke into the Niagara Falls park.

Dylan Powell of the group Marineland animal defense, which organized the protest, says it was a spontaneous action.

Marineland has said that its animals are well cared for.