Authorities need your help locating two missing girls from eastern Iowa

More than 350 volunteers have joined authorities in searching for two young cousins from the Waterloo, Iowa area whose bicycles were found abandoned near a lake.

The investigation into the disappearance of 8-year-old Elizabeth Collins and her 10-year-old cousin, Lyric Cook-Morrissey, entered its third day Sunday.

Authorities said the girls were last seen shortly after noon Friday in downtown Evansdale. Their bikes were found at nearby Meyers Lake a few hours after they were reported missing.

Black Hawk County Sheriff's Deputy Rick Abben said authorities have found no other clues, but managed to search about 40 percent of the lake by Sunday afternoon. They also are interviewing family, friends, and registered sex offenders who live in the area.

Here is a link to a photo of the girls, submitted by a viewer.

The Associated Press contributed to this report.