You are right, it's legitimate, I did a quick Google News search and there are a number of news articles about them.
Here is one:
Missing Maryland Teens Rachel Smith, Rachel Crites
http://www.postchronicle.com/news/original/article_21260520.shtml
Police are looking for two Montgomery County Maryland teenagers who never returned to their homes after telling parents they were going to a movie on Friday, authorities said yesterday.
Police have stated that there is no evidence of foul play at this time in the disappearance of the two female teenagers. The Montgomery police released a statement yesterday by way of the detectives from the Family Crimes Division, who "are concerned about the mental state of both girls and want to make certain that the teens know that whatever concerns or problems they may be facing can be worked out."
The detectives' concern seems to stem from "comments that the teens have made in the past," Lucille Baur, a spokeswoman for Montgomery police, told reporters.
The missing teens are Rachel Samantha Smith, 16, of Potomac and Rachel Lacy Crites, 18, of Gaithersburg. "They have been good friends for at least a year," according to Bauer.
Authorities say that the two teenagers might have gone to Charlestown, W.Va., on Friday.
"We're asking that they please call and let us know they're all right," said Officer Melanie Hanley, a police spokeswoman.
The teenagers are believed to be driving a dark blue 1997 Subaru Outback station wagon with Maryland license plates MBJ-485.
Anyone with information about either of these girls is asked to call the Montgomery County police non-emergency telephone number, 301-279-8000, or the Family Crimes Division at 240-773-5400.
Best case scenario: The girls are scared of turning themselves in.
If Rachel Crites is 18, she could face kidnapping charges.