11.   News helicopters roared over Parker Center, downtown police headquarters.

12.   Nineteen warships from five Allied nations sailed up the Neva River on Monday as fighter jets and helicopters roared overhead in mock battle.

13.   The group hit the ground, lying in the dirt until the helicopters roared away.

14.   Then an Apache attack helicopter roared in, answering a call, and fired a Hellfire missile into the bunker.

15.   Water dumping helicopters roared overhead and many streets were blocked off amid safety concerns and choking smoke.

16.   Helicopters roared through the air, whisking the injured from desolate mountain villages to local hospitals, in hopes of beating death.

17.   A Chinese frigate cruised just beyond the lagoon as the helicopters roared over.