Cedar Rapids police said they've received three calls about a man riding a bike naked near Cedar Lake since the beginning of September.
Just before 6:10 a.m. Thursday, police said they got a report of a naked man on a bike on the trail near Cedar Lake. Officers could not find the individual.
Police said they've also gotten reports from Sept. 3 and Sept. 12.
Authorities don't believe the person is approaching or trying to talk to anyone.
The police department has increased its control around Cedar Lake.