Black Hawk helicopters rattle windows in downtown Denver

Denver residents were at first alarmed, then puzzled by the Black Hawk helicopters that rattled windows in downtown Denver on recent nights.

Helicopters with U.S. Special Operations Command continued to fly low over downtown Denver on Tuesday night on the second of five consecutive training nights.

The training exercises are designed to improve special operations forces' abilities to work within populated areas.

"Their doors were open and people were hanging out and appeared to be looking down," said downtown resident John Daley.

"It was eerie. You had a sense something was up," said Daley. "It was a bit unsettling."

Lt. Steve Ruh, U.S. Special Operations Command spokesman, said the training is related to the continued fight against terrorism, but he declined to give any specifics.

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