LINCOLN, Neb. (AP) - Nebraska prison officials say two inmates convicted of sexual assault have escaped from the Lincoln Correctional Center. After a head count Friday afternoon, the Department of Correctional Services confirmed that 37-year-old Armon Dixon and 52-year-old Timothy Clausen were missing. The Lincoln Journal Star reports Dixon is in prison for charges including first-degree sexual assault, robbery and use of a deadly weapon to commit a felony. Department records also show Clausen is serving time for first-degree sexual assault of a child and tampering with a juror.