1.   A passer-by spotted an abandoned plastic bag and alerted police.

2.   After the local police were alerted, a man was apprehended suspected to be disturbing the terns and collecting their eggs.

3.   An anonymous caller alerted the police that a bomb was due to go off.

4.   One or two commuters alerted police on their cellular phones.

5.   Police were alerted when neighbors complained of a nasty smell coming from the basement.

6.   Strategically placed video cameras can alert police to any trouble.

7.   The school immediately alerted the police.

8.   The wireless remote receiver also can be connected to your home security system to alert the police.