EVANSDALE, Iowa — More than 350 volunteers joined authorities Sunday in a search for two young Iowa cousins whose bicycles were found abandoned near a lake.

Family members held out hope even as investigators said they had found no new clues that could lead them to the girls, who were last seen shortly after noon Friday. Authorities located the bikes of 8-year-old Elizabeth Collins and her 10-year-old cousin, Lyric Cook-Morrissey, at Meyers Lake a few hours after they were reported missing.

The Des Moines Register reported (http://dmreg.co/MaEPWe) that investigators had managed to search about 40 percent of the lake, and were also interviewing family, friends and registered sex offenders who live in the Evansdale area. Black Hawk County Sheriff’s deputy Rick Abben said authorities have found no new clues.

The mothers of both girls said they were trying to stay strong as the search entered its third day.

“Today I’m feeling pretty good,” Misty Cook-Morrissey said as crews assembled to look for her daughter and her niece. “Sometimes, when you think about it, you wonder if they’re dead somewhere, but you try to push those thoughts out of your mind.”