Four Greenpeace protesters that chained themselves inside the Enbridge Energy offices in downtown Vancouver have been arrested and removed from the building.

The demonstrators, hoping to highlight their campaign to stop a proposed oil pipeline project, entered the sixth floor offices on Wednesday holding a banner saying "Enbridge, no pipeline, no tankers."

They also set up a mock oil spill on the busy sidewalk outside.

In Pictures: Greenpeace oil protest

Vancouver police say officers arrested the group shortly before 1 a.m. Thursday after intervening at the request of the building owner.

Const. Jana McGuinness said only one of the female protesters agreed to leave on her own and is facing a mischief charge.

The other three protesters, two women and a man ranging from 26 to 31-years-old, had to be cut out of their chains and face mischief and trespassing charges. All were taken to jail and later released on a promise they wouldn't go back to the office.

Activists continued their protest outside the building on Thursday.

Greenpeace hopes the latest arrests and fake oil spill highlight its campaign to force Calgary-based Enbridge to withdraw plans for a pipeline from Alberta to Kitimat, B.C., carrying oil sands crude to overseas markets. The 1,170-kilometre pipeline, which cuts through northern B.C.'s Great Bear Rainforest, would see more than 200 oil tankers in the region annually.

Stephanie Goodwin, Greenpeace B.C.'s director, says Enbridge is poised to be "the BP of B.C.," and her group is taking action so Canada's west coast doesn't suffer the same fate as the Gulf of Mexico.

"If Enbridge's Northern Gateway Pipelines project goes ahead, it's not a question of if a spill will happen, but when, where and how large," she said.

Greenpeace is calling for an immediate ban on all new offshore drilling.

The actions come just days after an Enbridge pipeline running from Indiana to Ontario spilled 3.7 million litres of crude oil into a waterway in southwest Michigan.

Michigan Governor Jennifer Granholm says the efforts being undertaken by Enbridge and the Environmental Protection Agency to clean up the spill are "wholly inadequate" and she has called on the U.S. government for more help.