Photos: Protesters on St. Johns Bridge

An activist climbs past a colorful banner while hanging from the St. Johns bridge in Portland, Ore. on July 29.

A Coast Guard helicopter flies overhead as activists unfurl colored banners while hanging from the St. Johns bridge in Portland, Ore., on July 29.

An activist watches while hanging fro the St. Johns bridge as the Royal Dutch Shell PLC icebreaker Fennica turns around in Portland, Ore., on July 30.

An activist hangs from the St. Johns Bridge in Portland, Ore., on July 29, 2015, to protest the departure of Royal Dutch Shell PLC icebreaker Fennica, which is in Portland for repairs.

The Coast Guard keeps an eye on kayakers that are part of an effort to block the Royal Dutch Shell PLC icebreaker Fennica from leaving for Alaska in Portland, Ore., on July 30.

Royal Dutch Shell PLC icebreaker Fennica heads back to the Portland of Portland, at left, after it was blocked on its way to Alaska by activists hanging from the St. Johns bridge in Portland, Ore., on July 30.

Activists hang from the St. Johns bridge in Portland, Ore., on July 29, to protest the departure of Royal Dutch Shell PLC icebreaker Fennica, which is in Portland for repairs.

Activists hang from the St. Johns Bridge on July 29, in Portland, Ore., to protest the departure of Royal Dutch Shell PLC icebreaker Fennica, which is in Portland for repairs.

A security patrol keeps an eye on kayakers that are part of an effort to block the Royal Dutch Shell PLC icebreaker Fennica from leaving for Alaska in Portland, Ore., on July 30.