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PHILADELPHIA — Airline officials are trying to figure out how a sleeping passenger was left aboard a flight for four hours after it landed in Philadelphia.

According to police and the Transportation Security Administration, the passenger didn’t wake up when her United Express flight from Dulles airport outside Washington landed shortly after midnight Tuesday. At about 4 a.m., a cleaning crew found her.

United Airlines said it is working with a regional partner carrier to determine why the plane wasn’t cleared upon landing.

WYOMING

Group: Attacks on rangers on rise

LARAMIE — An environmental group that advocates on behalf of government employees says anti-government rhetoric may have fueled a surge in attacks and threats against law enforcement rangers in national parks last year.

The group Public Employees for Environmental Responsibility said it used the Freedom of Information Act to compile a list of 158 threats and attacks against law enforcement rangers in national parks in 2009.

That’s up from 36 tallied in 2008 and the previous high of 111 in 2004.

The group’s executive director, Jeff Ruch, said he’s concerned that anti-government sentiment is partly to blame. He said the National Park Service should do more to track such incidents.

Park Service spokesman David Barna didn’t return messages seeking comment.

From wire dispatches and staff reports