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HAGERSTOWN, Md. (AP) _ The second ice storm in a week closed schools Wednesday in the mid-Atlantic states and caused scattered power outages.

Freezing rain and slush coated roads from Virginia north into New Jersey and westward into parts of the Ohio Valley. However, the National Weather Service canceled most winter weather and storm advisories as warmer air moved northward.

Secondary roads were slippery across western Maryland, where ice was up to a half-inch thick in places.

``Most people are staying home,'' said Maryland State Police Cpl. David Paskowski.

In the Washington area, Delta Airlines canceled most of its flights at Dulles International Airport, and Atlantic Coast Airlines, which operates the United Express Shuttle, canceled about a third of its flights by 7:30 a.m., according to Airports Authority spokesman Tom Sullivan.

Baltimore-Washington International Airport had numerous delays and cancelations, said spokeswoman Melanie Miller.

State offices were closed and classes were canceled at schools and colleges across central Pennsylvania, where many roads were sheets of ice.

Interstate 80 was shut down near Hazleton, Pa., after a tractor-trailer rig jackknifed. Several trucks collided and one burst into flame, but no serious injuries were reported, state police Lt. Stephen Barilar said.

Some school districts closed or delayed opening schools in West Virginia, Virginia and Maryland.

Utilities in Maryland said accumulating ice had cut electrical service to more than 38,000 homes and businesses across the central and western parts of the state.

About 24,000 customers in northern Virginia and the Shenandoah Valley had no electricity by midmorning, Dominion Virginia Power spokesman David Botkins said. Maryland's major utilities reported scattered power outages affecting some 8,000 customers.

In the Ohio Valley, some Indiana school districts canceled classes because of up to 3 inches of snow and freezing rain.

In North Carolina, meanwhile, Duke Power said Wednesday it still had 127,000 customers without power because of last week's ice storm, down from a peak of nearly 1.3 million. The company said it hoped to have all custo0mers back on line by Saturday.

Carolina Power & Light said it had 15,225 customers still in the dark, down from a peak of 464,000.

Cleaning up fallen tree limbs and other debris in North Carolina could cost $50 million to $75 million and take months to complete, the state said.