Police say that a group of six male teenagers were found running, then swimming naked in a lake.
All six have been found and were given citations for disorderly conduct.
Authorities say a driver told them that six males, ages 17-19, were running south on North Lake Road in Oconomowoc at about 12:55 a.m. Wednesday.
Officers came to the scene and found the teenagers swimming away from them in Fowler Lake.
Police caught one of them a short time later, and they discovered three more of them at a home.
The other two were reported missing, and dive teams from Delafield, Okauchee and Western Lakes attempted to find them.
One of the missing teenagers reached home at about 3:00 a.m., while the other was discovered going into his car just before 5:00 a.m.