EVANSDALE, Iowa (AP) – Authorities say they found no new clues overnight in their search for two northeast Iowa girls who went missing while riding their bikes.

More than 350 volunteers joined the search effort Sunday, as an investigation into their disappearance entered its third day.

Authorities say 8-year-old Elizabeth Collins and her 10-year-old cousin, Lyric Cook-Morrissey, were last seen shortly after noon on Friday. Their bikes were located at nearby Meyers Lake a few hours after they were reported missing.

Black Hawk County Sheriff’s deputy Rick Abben says authorities have found no other clues, but officials have managed to search about 40 percent of the lake. They are also interviewing family, friends, and registered sex offenders who live in the area.