Jessica Benson, missing Milwaukee college student, suspected of aiding in robbery prior to disappearance, report says

(CBS) MILWAUKEE - Jessica Benson, a 22-year-old woman who has been missing along with her boyfriend since May 11, is suspected of aiding in a robbery four days prior to her disappearance, according to a search warrant obtained by the Milwaukee Journal Sentinel.

Police reportedly suspect Benson helped plan a robbery that took place May 7 at her place of employment, the Educators Credit Union in Milwaukee. According to the paper, Benson was working when two men, identified as 25-year-old Kevin Blackburn and 31-year-old Ricardo Perkins, both of Milwaukee, robbed the financial institution through a drive-thru window. Both men were later arrested.

The paper reports bank sources told police that a note used in the robbery contained terminology used internally by bank employees. Police also reportedly received a tip from an unnamed witness that Benson and her boyfriend, Nathaniel Robinson, planned the robbery at the credit union.

Benson, who was scheduled to graduate from Mount Mary College last month, and her boyfriend disappeared shortly after the robbery. Benson was reportedly last heard from on May 11, when she called in sick to work. According to the paper, authorities conducted a welfare check on May 14 and found the couple's apartment had been cleared out.

Witnesses reportedly told police that Benson and Robinson were seen moving furniture into a U-Haul truck sometime after dark between May 3 and 10. On May 13, Benson was reportedly caught on surveillance footage returning a rental car she had been using along with a second car and a U-Haul truck.

The 22-year-old was also reported to have changed her appearance in the days leading up to her disappearance.

"The bank robbery remains under investigation and [Benson] remains missing," Sgt. Mark Stanmeyer said Tuesday, according to the paper. He reportedly declined to comment on the information cited in the search warrant.