WASHINGTON (Reuters) - The U.S. Capitol and Supreme Court were temporarily evacuated on Wednesday when a small plane entered restricted airspace during preparations for former President Ronald Reagan's funeral, Capitol Police and Court spokesmen said.
Authorities quickly declared the incident a false alarm and sounded an all-clear.
The orders to evacuate were given as the jumbo jet carrying Reagan's body to lie in state in the Capitol before his funeral on Friday approached Andrews Air Force Base.
Officials said the alarm was sounded when the small plane, carrying Kentucky Gov. Ernie Fletcher, entered restricted airspace.
Federal Aviation Administration officials said the twin-engine turboprop aircraft, registered to the Kentucky state police, had trouble transmitting an electronic identification signal while flying through the restricted airspace.
Air traffic controllers subsequently were able to contact the pilot by radio to identify the aircraft, which had permission to enter the restricted area and land at Ronald Reagan Washington National Airport.
"There is no threat," said an FAA spokesman.
Employees at the Supreme Court were told to shelter in the basement before police gave the all-clear. Reuters reporters at the Capitol said fire alarms rang out and police officers shouted at people to "run, run, run."
At least one officer warned about an incoming aircraft.
There have been many false alarms since the Sept. 11, 2001, airborne attacks, often sparked by small planes and commercial airlines straying into restricted airspace.
Reagan National Airport has been off limits to small planes since the attacks because of its proximity to the Pentagon, the White House, the Capitol and other landmarks, but VIPs have received waivers.