21.   I am the dozens of passengers aboard the other hijacked planes who called loved ones to say goodbye, or tried to alert authorities.

22.   If you get something that looks like a legitimate threat, you alert the authorities, although such occurrences are rare.

23.   It is the second time this year that dealers are known to have alerted the authorities to an auction of works they found suspect.

24.   Officials said that a breakthrough in the investigation came when a witness alerted authorities to a rented car that was parked at the Boston airport.

25.   Officials said that a breakthrough came when a witness alerted the authorities to a rental car parked at Logan International Airport in Boston.

26.   She recently told an acquaintance who Echols was and that man alerted authorities, said Pose.

27.   Six days later, his friends alerted authorities when he failed to show up to work at a New York City publishing house.

28.   Someone needs to alert the authorities.

29.   Software will be in place to alert authorities to unusual stock movements, which could be a sign of insider trading.

30.   Still, James Alan Fox, dean of the college of criminal justice at Northeastern, said it is not surprising that neighbors did not alert authorities.