NEW YORK — An underground steam-pipe explosion tore through a Manhattan street near Grand Central Terminal on Wednesday, swallowing a tow truck and killing one person as hundreds of others ran for cover amid a towering geyser of steam and flying rubble.

Mayor Michael Bloomberg said the explosion was not terrorism, although the blast caused a brief panic about a possible attack.

"There is no reason to believe whatsoever that this is anything other than a failure of our infrastructure," he said of the 24-inch steam pipe that had been installed in 1924.

One person was pronounced dead at Bellevue Hospital from an apparent heart attack, Bloomberg said. About 30 people were injured, at least four seriously. Authorities could not immediately account for how the most seriously wounded victims were injured.

The explosion caused widespread chaos as residents and commuters heard a huge blast and feared the worst. Thousands of commuters evacuated the train terminal, some at a run, after workers yelled for people to get out of the building.

A titanic geyser of steam and mud shot from the center of the blast, generating a tremendous roar. The initial burst of steam rose higher than the nearby 77-story Chrysler Building, one of Manhattan's tallest buildings. The air near the site was filled with debris.

Debbie Tontodonato, 40, a manager for Clear Channel Outdoor, said she thought the rumble from the 6 p.m. explosion was thunder.

"I looked out the window and I saw these huge chunks that I thought were hail," she said. "We panicked; I think everyone thought the worst. Thank God it wasn't. It was like a cattle drive going down the stairs, with everyone pushing. I almost fell down the stairs."

Streets were closed for several blocks in all directions. Subway service in the area was suspended.

There were also concerns about what was spewed into the air. Some of the pipes carrying steam through the city are wrapped in asbestos. "The big fear that we have is there may or may not have been asbestos release," Bloomberg said.

Officials wouldn't know test results until later, the mayor said.

The steam cleared around 8 p.m., exposing a crater several feet wide in the street. A red tow truck lay at the bottom of the hole.          

Con Edison spokesman Chris Olert said workers still were trying to determine what caused the blast.

Millions of pounds of steam are pumped beneath New York streets every hour, heating and cooling thousands of buildings, including the Empire State Building.

The steam pipes sometimes are prone to rupture, however.

In 1989, a gigantic steam explosion ripped through a street, killing three people and sending mud and debris several stories into the air.

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