TORONTO – Police made more than 400 arrests after black-clad demonstrators broke off from a crowd of peaceful protesters at the global economic summit and went on a rampage in downtown Toronto that lasted into the early morning hours, authorities said Sunday.

The roving band of protesters torched four police cruisers and shattered shop windows with baseball bats and hammers for blocks, including at police headquarters, then shed some of their black clothes, revealing other garments, and continued their rampage.

Police used shields, clubs, tear gas and pepper spray to push back the protesters who tried to head south toward the security fence surrounding the Group of 20 summit site. Some demonstrators hurled rocks and bottles at police.

The vandalism occurred just blocks from where U.S. President Barack Obama and other world leaders were meeting and staying.