(CBS) – A woman jogger tells police she was robbed of her cell phone by a suspect armed with a screwdriver Friday morning at Buffalo Creek Forest Preserve.

Lake County Forest Preserve Ranger Police are investigating the armed robbery, which reportedly occurred at 8:15 a.m. in the northwestern suburb of Long Grove.

The female victim said the suspect grabbed her arm, threatened her with a screwdriver and fled with her cell phone toward Checker Road.

The woman was unhurt, and the cell phone was recovered nearby, ranger police said. Anyone with information is encouraged to call (847) 968-3405 or email forest preserve chief of police John Tannahill at jtannnahill@LCFPD.org.