The results of a tailing pond breach at Imperial Metals Corp's mine at Mount Polley are pictured Aug. 4, 2014 in this still image from aerial handout video.Reuters
Police say four people have been arrested following a protest against the Mount Polley mine at its head office in Vancouver.
Vancouver Police Department spokesman Const. Brian Montague says officers were called in on Tuesday when protesters entered the Imperial Metals office and allegedly began behaving aggressively towards staff.
Montague says four people were taken into custody for allegedly pushing and shoving people inside the office.
Another 15 to 20 people stayed outside of the building and continued what Montague calls a loud, but lawful demonstration.
The four arrested were all released without charge after protesters left the site.
The protesters say in a release that they were marking the second anniversary of a spill at the Mount Polley mine in the B.C.'s Interior, where a tailings pond collapsed, sending millions of cubic metres of waste into nearby waterways.