Missing woman Roberta Caskey called police before abduction

(CBS/WCCO/AP) VIRGINIA, Minn. - Officials in Minnesota say Roberta Caskey repeatedly called police in the hours before she disappeared to tell them her estranged husband had violated a restraining order.

Police in the city of Virginia, in northeast Minn., say they warned Timothy Caskey to stay away from his estranged wife after he called her several times July 14.

Timothy Caskey had just been released from prison after serving a sentence for violating a no contact order involving Roberta.

The couple remains missing and Timothy Caskey is facing federal kidnapping charges.

CBS affiliate WCCO reports that according to an FBI affidavit, witnesses saw Caskey grab his wife and throw her into a pickup truck. She struggled while two people tried to intervene, but Caskey fought them off and fled with his wife.

Police describe Roberta Caskey as a white woman, 5-feet-7-inches tall, 135 pounds, with brown hair.

According to Minnesota Public Radio News, the FBI has offered a $5,000 reward for information leading to Timothy Caskey's arrest.

Anyone with information about the case is asked to call the FBI at 612-376-3200.