Emergency crews were mopping up an ammonia leak from a boat at the OSI dock on Unalaska's Captains Bay Road midday Friday. They blocked off the road at the Crowley dock Friday morning, about a half mile closer to town, as they responded to the leak. At 11 a.m., Unalaska police officers moved the road block closer to OSI, stopping traffic just before the main entrance to the facility.
As of 12:30 p.m., OSI employees were still sheltering in place. Coast Guard and Unalaska Public Safety personnel were on the scene.
Officials said there was no imminent public health threat.