UPDATE 6-Shell's Arctic icebreaker threads human barricade as it departs Oregon
July 30, 2015 at 23:03 PM EDT
PORTLAND, Ore., July 30 (Reuters) - An icebreaking vessel key to Royal Dutch Shell's plans to drill for oil in the Arctic departed Portland, Oregon, late on Thursday, navigating between a narrow gap of environmental activists dangling from a bridge after a two-day human blockade.
