The base and schools in the area were put on lockdown and residents of the island were told to remain vigilant. The names of the victims will be released after their families have been notified, the coast guard said.
"It is possible that the suspect remains at large," Commanding Officer Captain Jesse Moore said.
"Since we don't have all the details, we strongly advise all Kodiak residents to remain vigilant and to report any suspicious activity to local law enforcement officials."
