A plane believed to be carrying eight people crashed in southwest Alaska and rescue crews were trying to reach the wreckage early Tuesday, authorities said.

A U.S. official said former Sen. Ted Stevens may have been aboard
crashed plane.

Alaska National Guard spokesman Maj. Guy Hayes said there are  possible fatalities. A National Transportation Safety Board investigative team has been dispatched from Washington, D.C., and was expected on the ground Tuesday morning.

Hayes said the Guard was called to the area about 20 miles north of  Dillingham at about 7 p.m. Monday after a passing aircraft saw the downed plane. But severe weather has hampered search and rescue efforts.

Hayes said about five good Samaritans were on scene early  Tuesday helping the crash victims. He said he was told by Alaska State Troopers that there were “eight or nine” people on board, though a spokeswoman for the troopers, Megan Peters, refused to comment.

She said all the agency could say for sure is that a plane went down  and crews were “aggressively” trying to reach the crash site but having difficulty doing so. As of 4 a.m. Tuesday, she said she still hadn’t received word that crews had reached the site.

“I can’t go beyond, 'We’re responding to a plane crash,' " she said.

The National Weather Service reported rain and fog at Dillingham, with low clouds and limited visibility early Tuesday.

Conditions ranged from visibility of about 10 miles reported at  Dillingham shortly before 7 p.m. Monday to 3 miles, with rain and fog, reported about an hour later, according to the agency.

The aircraft is a 1957 DeHavilland DHC-3 Otter registered to  Anchorage-based communications company GCI, the Federal Aviation Administration told the Anchorage Daily News. A woman at the Regional Operations Center told The Associated Press all further information was pending notification of next of kin.

Dillingham is located in northern Bristol Bay, about 325 miles southwest of Anchorage.

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