ST. PAUL (AP) - Two teenage girls in Minnesota have escaped a robbery at knifepoint by outrunning a man who they told police was heavyset.

Bradley Schaefer on Monday called a St. Paul sergeant he knows and said he tried to rob two girls. The 45-year-old was charged with two counts of attempt to commit first-degree aggravated robbery.

The 14- and 15-year-old girls tell police they were walking in St. Paul when a man approached them with a steak knife and demanded their purses. The girls say he chased them but he was too slow and they lost him.

Schaefer tells officers the girls got away because he's out of shape.

Schaefer is in Ramsey County Jail on $70,000 bond. Online jail records didn't indicate an attorney.