New York City firefighters work in the debris of the building struck by a small airplane on New York's Upper East Side, Wednesday afternoon, Oct. 11, 2006.

New York ? A small plane with New York Yankees pitcher Cory Lidle aboard crashed into a 50-story condominium tower Wednesday on Manhattan’s Upper East Side, killing two people and raining flaming debris on sidewalks, authorities said. There was no immediate confirmation Lidle was among the dead.

The FBI and the Homeland Security Department said there was no evidence it was a terrorist attack. “The initial indication is that there is a terrible accident,” Homeland Security spokesman Russ Knocke said. Nevertheless, fighter jets were sent aloft over U.S. cities as a precaution, the Pentagon said.

The plane hit the 20th floor of the Belaire _ a tower overlooking the East River, about five miles (8 kilometers) from the World Trade Center _ on a hazy, cloudy afternoon with a loud bang, touching off a raging fire that cast a pillar of black smoke over the city and sent flames shooting from four windows on two adjoining floors.

Firefighters shot water streams of water at the flames from the floors below and put the blaze out in less than an hour.

Police said two people were killed, but they did not say whether they died aboard the plane or on the ground.

Young May Cha, a 23-year-old Cornell University medical student, said she was walking back from the grocery store down 72nd Street when she saw an object out of the corner of her eye.

New York Yankees pitcher Cory Lidle reacts after giving up 4 runs to the Baltimore Orioles in only 1 2/3 innings of a baseball game in this Friday, Sept. 8, 2006 file photo in Baltimore. A small plane with Lidle aboard crashed into a 50-story condominium tower Wednesday on Manhattan's Upper East Side, killing two people and raining flaming debris on sidewalks, authorities said.

“I just saw something come across the sky and crash into that building,” she said. Cha said there appeared to be smoke coming from behind the aircraft, and “it looked like it was flying erraticaly for the short time that I saw it.”

“The explosion was very small. I was not threatened for my life,” she added.

Richard Drutman, a professional photographer who lives on the 11th floor, said he was talking on the telephone when he felt the building shake.

“There was a huge explosion. I looked out my window, and saw what appeared to be pieces of wings, on fire, falling from the sky,” Drutman said. He and his girlfriend quickly evacuated the building.

The Federal Aviation Administration said it was too early to determine what type of aircraft was involved, or what might have caused the crash. There was no immediate word on where the plane came from or where it was headed.

“Fighters are airborne over numerous U.S. cities and while every indication is that this is an accident we see this as a prudent measure at this time,” said Sgt. Claudette Hutchinson, a spokeswoman for the North American Aerospace Defense Command in Colorado Springs, Colo.

However, all three New York City-area airports continued to operate normally, FAA spokesman Jim Peters said. In Washington, White House spokesman Tony Fratto said neither President George W. Bush nor Vice President Dick Cheney was moved to secure locations.

And Homeland Security’s Knocke said: “There is no specific or credible intelligence suggesting a threat to the homeland at this time.”

The crash struck fear in a city devastated by the attacks of Sept. 11 five years ago. Sirens echoed across the neighborhood as emergency workers and ambulances rushed in with stretchers. Broken glass and debris were strewn around the neighborhood.

“There’s a sense of helplessness,” said Sandy Teller, watching from his apartment a block away. “Cots and gurneys, waiting. It’s a mess.”

The tower was built in the late 1980s and is situated near Sotheby’s auction house. It has 183 apartments, many of which sell for more than $1 million (?800,000).

Several lower floors are occupied by doctors and administrative offices, as well as guest facilities for family members of patients at the Hospital for Special Surgery, hospital spokeswoman Phyllis Fisher said.

No patients were in the high-rise building and operations at the hospital a block away were not affected, Fisher said.