Suddenly the vibrations became the thunder of a low-flying helicopter.

Many animals were slaughtered by the country's military, which used low-flying helicopters to take pot shots at big game.

Sirens, low-flying helicopters and airplanes all made their customary appearances, but no one seemed to mind.

Their conversation was drowned by the drone of a low-flying helicopter.

Even the low-flying helicopters sometimes couldn't find a hole to go down through.

Part of the explanation, one official said, may be that fighters are simply firing at low-flying American helicopters.

A second later, my attention was drawn by a very low-flying black helicopter hovering over the tip of Manhattan.

As he was speaking, a volley of fire pursued a low-flying helicopter, which moved swiftly away.

The blades of a low-flying helicopter stir up the water beneath.

Over to my right, toward the hotel, a low-flying helicopter lit up the sky with its Nightsun.