The Latest on an mistaken tsunami test message sent on Alaska's emergency alert system (all times local):

11:15 a.m.

The National Weather Service says a "truncated version" of a tsunami test message was erroneously broadcast as a warning on Alaska's emergency alert system.

The agency in a statement says it is investigating why the message was sent and will provide more information later.

The National Tsunami Warning Center is a part of the National Weather Service and says it issued a routine tsunami test message Friday morning that was misinterpreted by at least one unspecified entity as an official tsunami warning.

The center says there was no tsunami threat.

Alaska's emergency management agency says tsunami-vulnerable communities were notified by the state emergency operations center that there was no threat.

___

9 a.m.

Some Alaskans got a jolt when they heard an emergency radio and television broadcast indicating the entire U.S. West Coast from San Diego to Alaska's Aleutian Islands was under a tsunami threat. Only at the end of the message sent early Friday morning did it indicate the alert was a test.

The National Tsunami Warning Center says there was no tsunami threat.

The tsunami center says it issued a routine test message at 7 a.m. the same way all tests are sent. Typically, the message says it's a test at the beginning.

It's not clear why the version heard by Alaskans did not say it was a test until the end of the message.

The warning center told KTVA warning sirens may be going off in coastal areas.