CHICAGO (CBS)–Three teenagers accused of carjacking an off-duty Chicago police officer are facing life in prison after being indicted by a federal grand jury.

Raynell Lanford, 19, Jamar Jarvis, 18, and Jamaal Ashsaheed, 19, are each charged with vehicular hijacking and using a weapon in the crime.

READ MORE: Man Dies After Being Shot In West Garfield Park

In the early morning hours of October 18, detectives say they approached an off-duty officer in the Edgewater neighborhood, showed her a gun and demanded the keys to her Lexus SUV.

READ MORE: 15-Year-Old Critically Wounded, Among 2 Shot In Belmont Heights Online Sale Meetup

The teens are also charged with an attempted carjacking that happened a few hours earlier.

A fourth teenager, Javion Bush, 19, was charged as an accessory for helping the assailants after the carjacking, police said.

MORE NEWS: Dixmoor Boil Order Remains In Effect As Crews Continue Work To Identify Source Of Weeklong Water Woes

Their arraignments in federal court have not yet been scheduled.