The Latest: Federal officials will investigate explosion that demolished part of motel

The latest on an explosion that leveled part of a Motel 6 in Bremerton, Washington (all times local):

10 a.m.

Federal authorities will investigate the explosion that destroyed part of a hotel in Washington state.

Bremerton Fire Chief Al Duke says officials with National Transportation Board will respond, and that the inquiry could take several weeks.

The Tuesday night blast critically injured a gas company worker minutes after the acting hotel manager had evacuated the building due to a gas leak.

Duke says two firefighters were also blown back 20 feet by the force of the explosion. One suffered bruised ribs and another a concussion. He says they are recovering at home.

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9 a.m.

Two people are unaccounted for after an explosion demolished part of a Motel 6 in Bremerton, Washington.

The Tuesday night blast also critically injured a gas company worker minutes after the acting hotel manager had evacuated the building due to a gas leak.

Bremerton Fire Department Chief Al Duke told the Kitsap Sun (http://bit.ly/1JqTL1O ) that the missing people may not have been in the building at the time of the blast, but until they were located the search would continue.

Bremerton is located west of Seattle, across Puget Sound.

The motel manager said the facility had about 65 guests in 42 occupied rooms, and the explosion destroyed about one-quarter of the building.