NORAD: Military jets safely escort flight to New York City. Passengers cause security scare on American Airlines Flight 34 by behaving suspiciously in bathroom.

Three passengers on an American Airlines flight from Los Angeles to Kennedy Airport caused a scare by behaving suspiciously in a bathroom, sources said.

One source said they locked themselves in, another said they were going in and out of the restroom.

NORAD said fighter jets escorted the plane to JFK, where it landed safely just before 4:30 p.m.

Air Marshals were on board, law enforcement sources said.

American Airlines spokeswoman Andrea Huguely said the Boeing 767 was not in any danger.

"The captain and crew assessed the situation and they did not feel as though there was a security issue on board," she said.

"People have walked off the plane normally," she said.

There were at least two other major security incidents around the U.S. amid widespread jitters over a possible terror strike on the 10th anniversary of 9/11.

In Los Angeles, part of the city's Koreatown neighborhood was shut down Saturday night after a 62-year-old man planted a fake bomb on a bus, sheriff's officials said.

Frightened passengers were evacuated from the bus at around 6 p.m. after Eugenio Paredes came aboard carrying a shady-looking suitcase with exposed wires and began threatening the driver, cops said.

Metro trains and buses were diverted from the area for about four hours while police investigated the scene.

Paredes was arrested suspicion of making a terrorist threat and possession of a hoax device.

Earlier Saturday, a Southwest Airlines plane traveling from Albuquerque to Baltimore was forced to land in Nashville after the flight crew reported that a man was acting strangely.

The flight remained on the ground for about two hours, and a suspicious package was found near the rear bathroom, officials said.

FBI officials in Nashville told The Tennessean newspaper that the package turned out to be "non-explosive."

Flight attendants had become spooked after a man went to the bathroom twice, once while the plane was on the ground and once while in flight, Southwest officials said.

The unidentified flyer was detained and interviewed in Nashville and then later cleared to fly. He was not charged with a crime.

Meanwhile, the other 117 passengers were rescreened by security before boarding again.

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