The Federal Aviation Administration shut down airports nationwide.
CALIFORNIA: State put on high alert. State's Emergency Council convened as Gov. Gray Davis requested heightened security at all state buildings.
COLORADO: City and state officials stepped up security around government buildings. City opened an emergency preparedness office in the basement of City Hall, where representatives of police, fire and health agencies, public transportation officials, Denver International Airport and utilities were gathering.
FLORIDA: Security heightened at federal courts. Walt Disney World evacuated and closed its parks and shopping and entertainment complex.
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GEORGIA: All flights at Hartsfield Atlanta International Airport, the nation's busiest, stopped. The CNN Center, world headquarters of Cable News Network, closed to the public, although journalists at CNN and The Associated Press remained.
ILLINOIS: Sears Tower shut down, state government buildings in Chicago and Springfield closed. National Guard on state of heightened alert in Illinois.
KENTUCKY: Southern Governors' Association canceled annual fall meeting so governors of Arkansas, Georgia, Louisiana, Mississippi, Tennessee, Kentucky and West Virginia could head back to their states.
MARYLAND: Officials tightening security throughout the state. Security heightened at Andrews Air Force Base. Baltimore-Washington International Airport taking arrivals not departing flights.
MINNEAPOLIS: Minneapolis-St. Paul International Airport shut down. IDS Center in downtown Minneapolis, the tallest building in the state, evacuated.
NEVADA: Security increased at casinos on the Las Vegas Strip, at federal buildings across the state and Nellis Air Force Base near Las Vegas. Flights suspended.
NEW JERSEY: Airports and river crossings to New York City closed. Traffic reported snarled on the New Jersey Turnpike. PATH commuter trains canceled. At Newark International Airport, officers with shotguns blocked the road leading to Port Authority offices and the air traffic control tower.
NEW YORK: Security clamped down across the state. Security increased at border points. Gov. George Pataki canceled his New York City events. NEW YORK CITY: Elections called off. Airports closed. Trading on Wall Street suspended. United Nations building evacuated. Offices throughout Manhattan closed. Children in Manhattan kept in schools because their parents could not get to them. Subway lines shut down. Cellular phone service crippled. Regular phone service congested. Evacuations from Wall Street to the United Nations. Lower Manhattan closed to all but emergency vehicles. Bridges and tunnels into Manhattan closed. Rockefeller Center property managers urged tenants to go home.
NORTH CAROLINA: Military bases prepared for possible change in status. At Raleigh-Durham International Airport, spokeswoman Mirinda Kossoff said a strategy meeting was planned with the Federal Aviation Administration.
PENNSYLVANIA: Philadelphia International Airport closed. National Park Service officials meeting to determine whether the city's high-profile tourist attractions like the Liberty Bell and Independence Hall would be closed.
SOUTH DAKOTA: Commercial flights from Sioux Falls, Rapid City, Pierre and other South Dakota cities grounded.
TENNESSEE: Department of Energy's nuclear weapons and research complex in Oak Ridge put under heightened security. All flights from Tennessee's major airports grounded. Planes were allowed to land.
TEXAS: Some office buildings evacuated. Flights out of Dallas-Fort Worth International Airport canceled and Austin-Bergstrom International closed. City Hall in El Paso closed.
VERMONT: Federal buildings in Montpelier and Burlington open. State's lone atomic plant placed on heightened security.
VIRGINIA: Navy installations throughout Hampton Roads, home of the world's largest Navy base, placed under an increased security condition called Threatcon Charlie. Threatcon Charlie is implemented when an incident occurs or when intelligence is received that some form of terrorist action is imminent.
WASHINGTON: Airports and military bases throughout the state boosted security. Outgoing flights canceled at Seattle-Tacoma International Airport, but planes allowed to land. Federal Court House in downtown Seattle on high alert.
WEST VIRGINIA: Chemical plant security heightened. Flights out of Charleston's Yeager Airport, West Virginia's largest, suspended.