A news helicopter crashed into a street and burst into flames Tuesday near Seattle’s Space Needle, killing two people on board, badly injuring a man in a car and sending plumes of black smoke over the city during the morning commute.

The chopper was taking off from a helipad on KOMO-TV’s roof when it went down at a busy downtown intersection and hit three vehicles, setting them on fire and spewing burning fuel down the street.

Kristopher Reynolds, a contractor working nearby, said he saw the helicopter lift about 5 feet off the low-rise building before it started to tilt. The chopper looked like it was trying to correct itself when it took a dive.

“Next thing I know, it went into a ball of flames,” Reynolds said.

Witnesses reported hearing unusual noises coming from the helicopter as it took off after refueling, said Dennis Hogenson, deputy regional chief with the National Transportation Safety Board in Seattle. They also said the aircraft rotated before it crashed near the Seattle Center campus, which is home to the Space Needle, restaurants and performing arts centers.

Mayor Ed Murray noted the normally bustling Seattle Center was relatively quiet at the time. Had it been a busier day, “this would have been a much larger tragedy,” he said.

Murray added the city will review its policies about permitting helicopter pads in response to the crash.

Investigators were working to document the scene and clear the wreckage, and will examine all possibilities as they determine what caused the crash, Hogenson said. A preliminary analysis is expected in five days, followed by a fuller report with a probable cause in up to a year.

KOMO identified the pilot as Gary Pfitzner, of Issaquah. The other man killed in the crash was Bill Strothman, a former longtime KOMO photographer. Both men were working for Cahokia, Ill.-based Helicopters Inc., the leasing company that operates the Eurocopter AS350 helicopter.

Firefighters who arrived at the scene before 8 a.m. found a “huge black cloud of smoke” and two cars and a pickup truck engulfed in flames, Seattle Fire Department spokesman Kyle Moore said.

Fuel running down the street also was on fire, and crews worked to stop it before it entered the sewer, Moore said.

An injured man managed to free himself from a burning car and was taken to Harborview Medical Center, Moore said. The man was on fire, and a police officer helped him to the ground and put out the flames, said police spokeswoman Renee Witt.

Richard Newman, 38, suffered burns on his lower back and arm, covering up to 20 percent of his body. He was in serious condition in the intensive care unit and likely will require surgery, the hospital said.

Two others who were in cars that were struck by the helicopter were uninjured. One of them, a woman, went to a police station and talked to officers, while a man from the pickup walked to a nearby McDonald’s restaurant. Police later located him unhurt.

The Seattle Monorail, which runs about 50 yards away, was operating Tuesday morning and passed the scene about 15 seconds before the crash happened, said Thomas Ditty, the monorail’s general manager.

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Other cities have experienced helicopter crashes as TV stations rush to cover the news from above major cities.

Two news helicopters collided in midair in Phoenix in 2007 as the aircraft covered a police chase, sending fiery wreckage plummeting onto a park. Four people in the helicopters were killed.

The crash prompted changes at the stations in how they operated their helicopter crews.