Ramapo Town Police Department has issued an Amber Alert for a missing 15-year-old girl.

Authorities are trying to figure out the whereabouts of Daisy Castillo . The teen has vanished after last being seen around 1 a.m. Monday, July 21 in the Village of Montebello in Rockland County where she was walking along East Mayer Drive. She was reportedly wearing a light-colored hoodie and sweatpants.

Police say they have reason to believe Castillo may be in Spring Valley and also in need of medical attention but didn't issue any further details, according to a press release from NY Alert. Daisy is described as 5 feet, 0 inches tall and 125 lbs. with brown hair and brown eyes.

If you think you may have spotted Daisy Castillo early Monday morning or have any information that could help police locate her, you're urged to contact authorities right away by calling 9-1-1 or Ramapo Town Police directly at (845) 357-2400.