McKINNEY, Texas (KTEN) — McKinney police issued an Amber Alert early Friday for two missing sisters who are believed to be "in grave or immediate danger."

Police said the girls — six-year-old Jennifer and nine-year-old Jessica Burns — are believed to have been abducted by a woman identified as their grandmother, Jame Burns, 60. 

The suspect was driving a black Ford Escape sport utility vehicle with Texas license plate MTC-609 when last seen in McKinney, 30 miles south of Sherman. The vehicle has a scratch on the front, silver door handles and a black interior.

Police said Jame Burns is white, 5'-2", 230 pounds with brown hair and brown eyes. McKinney PD is working with the FBI on the case.

McKinney police said Jame Burns, 60, abducted her two granddaughters.

"The girls were last seen just before six last night at a restaurant near Central Expressway and Virginia Parkway, where they had been having a supervised visit with their father, along with CPS, who had temporary custody of the girls," police said in a written statement.

Jennifer Burns was wearing glasses with purple frames, a light blue shirt with a sparkle design, and blue jeans when last seen.

Jessica Burns was wearing dark frame glasses, a red long-sleeve shirt with black shoulders/sleeves and blue jeans.

Police said the girls were taken from a Cici's Pizza restaurant on Thursday evening. They were there on a supervised visit with their non-custodial father, Justin Burns. He is being held on kidnapping charges.

Contact McKinney police at 972-547-2700 or call 911 if you have any information leading to the missing girls.