( CNN ) -- State and federal authorities are investigating the apparent double homicide of two Coast Guard members who were shot dead on an island off Alaska 's coast , prompting the lockdown of their base and at least one nearby school . It 's possible that the shooter , or shooters , remain at large , according to a Coast Guard statement . `` We 're treating this as a double homicide , '' said FBI spokesman Eric Gonzalez , who noted that the slayings occurred inside the Coast Guard Communications Station Kodiak . Coast Guard investigators , island police , state troopers and the FBI are investigating the incident . `` We are deeply saddened that we lost two shipmates , '' Capt . Jesse Moore said in a news release . `` This is a rare occurrence , and we are going to do everything possible to ensure we find out exactly what happened . '' The victims have not yet been identified by name . Their base is on what the city of Kodiak 's website calls the second-largest island in the United States , situated in the Gulf of Alaska about 250 miles southwest of Anchorage . The borough of Kodiak Island has about 13,600 people , according to the U.S. Census Bureau . The Coast Guard facility normally houses about 60 people . `` It 's definitely the topic of conversation right now , '' said Cheryl Montgomery , a manager at Henry 's Great Alaskan Restaurant . `` The town 's people are very much on edge here . '' Montgomery said that her restaurant remained abuzz Friday with rumors of who may have carried out the shootings , though `` nobody knows what 's actually going on . '' `` There 's so many weird and bizarre stories running around right now , '' she said . City Manager Aimee Kniaziowski said her office has not been instructed to take additional security precautions . `` We 're just conducting our business until we 're told otherwise , '' she said . The small town is reeling from the loss , she added , calling the killings `` devastating . '' Peterson Elementary School , which is on Coast Guard property in Kodiak , went into lockdown mode around 8:30 a.m. ( 12:30 p.m . ET ) after school leaders got a call from military police , Principal Beth Cole said . By 11 a.m. , they shifted to `` lock in '' mode , allowing for more movement within the school , though lunch was still delivered to students in class as a precaution , Cole said . No people were allowed in and out of the building all day . Three other elementaries , one middle school and one high school on the island were also affected , school district Superintendent Stewart McDonald said . Those schools were on `` lock in '' status starting at 11:30 a.m. so that activities could continue as normal , except for the fact that no one could enter or leave the buildings . At the time , Kodiak High School was hosting an Alaska Association of Student Government meeting involving youths from around the state . All restrictions for the district 's roughly 2,200 students were called off about 1 p.m. after state troopers called school officials and said that operations could return to normal , according to McDonald . CNN 's Alta Spells contributed to this report .
Schools on Kodiak island were given the all-clear at 1 p.m. , an official says . Two Coast Guard members are killed at their station on that island in the Gulf of Alaska . - The U.S. Navy destroyer USS Lassen collides with a cargo ship off Hawaii and sinks it.