1.   Once outside, they said, they rang apartment buzzers to try to warn sleeping residents.

2.   Ring the buzzer.

3.   Should you ring the buzzer?

4.   They left the building, and he also rang buzzers to alert people.

5.   Tuesday night, a reporter got no response when he rang the buzzers for the apartments.

6.   When he rang the buzzer again, Simpson answered almost immediately.

7.   Moments later, when he rang the buzzer again, Simpson answered, saying he had fallen asleep and would be right down.

8.   When a buzzer is rung, a door opens and a platform is lowered to receive the baby.