Late Tuesday night the Los Angeles Police Department issued a critical missing bulletin 13-year-old Karina Valencia of Sylmar.

Late Tuesday night the Los Angeles Police Department issued a critical missing bulletin for 13-year-old Karina Valencia of Sylmar.

"The family of Karina Valencia and the Los Angeles Police Department (LAPD) are asking for the public's assistance in locating Karina, who has been missing since Saturday.

"On August 14, 2010 at around 6:30 p.m., Karina was last seen at a friend's birthday party in the 13800 block of Polk Street in LAPD's Mission Area. She has not had contact with her family since that time and there is great concern for her welfare. It is possible that Karina met an unknown male on the popular website, MySpace, and left to meet up with him.

"Karina has been known to frequent Sylmar Park located at Polk Street and Bordon Avenue, as well as the Sylmar Library located 14561 Polk Street, Sylmar.

"Karina is described as a female Hispanic with long brown hair and brown eyes. She stands about 5 feet 3 inches tall and weighs approximately 90 pounds. She was last seen wearing a white "Madonna" shirt and black shorts.

"Anyone with information regarding the whereabouts of Karina Valencia is urged to contact LAPD Mission Division at (818) 838-9800. During non-business hours or on weekends, calls should be directed to 1-877-LAPD-24-7. Anyone wishing to remain anonymous should call Crime Stoppers at 1-800-222-TIPS (800-222-8477). Tipsters may also contact Crime Stoppers by texting from their with a cell phone to 274637 (C-R-I-M-E-S on most keypads). All text messages should begin with the letters "LAPD." Tipsters may also go to LAPDOnline.org, click on "Anonymous WebTips" and follow the prompts," a LAPD news release stated.