11.   Sirens pierced the air as police checked congressional buildings for bombs.

12.   The crying of children pierced the air.

13.   The two boys, full of tales from camping out on a backyard trampoline, were chattering away at their dad when screams pierced the air.

14.   Tired Indian chants pierced the air.

15.   When Chad Curtis needs the attention of his fellow outfielders, he lets out a loud, high-pitched whistle that seemingly pierces the air like a laser.

16.   Windows along the square were smashed, sidewalks were littered with rocket fragments and sirens pierced the air as ambulances responded.

17.   Countless spotlights pierced the air above the stadium, illuminating it against the mountain backdrop at dusk.

18.   Clouds of black smoke had hung over several parts of the city earlier in the day and the sound of gunshots pierced the air.

19.   Clouds of black smoke hung over several parts of the city and the sound of gunshots pierced the air.

20.   Countless spotlights pierced the air above the stadium, illuminating it against the mountain backdrop.