LINCOLN, Neb. (AP) — A mistrial has been declared in the case of an Arizona man charged with sexually assaulted another student in a dorm at the University of Nebraska-Lincoln.

The case against 19-year-old Christopher Petersen went to jurors Thursday, but they were unable to reach a verdict by Friday afternoon and a mistrial declared.

Prosecutors say Petersen and the woman went to her room on Sept. 5 last year and began kissing. The woman told investigators that Petersen continued kissing and groping her after she told him to stop. Petersen said he never heard her say no.

Prosecutors must decide whether to try the case again or drop the charge against Petersen. Defense attorney Bob Creager (KREE’-gur) says he’ll also consider his client’s options.