Investigators searching for two missing Iowa cousins say they want to interview a person who was paddleboating on a lake near where they disappeared 10 days ago.

FBI spokeswoman Sandy Breault said Monday that investigators want to interview the person who was boating July 13 on Meyers Lake because that person may have information that could help the search for 10-year-old Lyric Cook-Morrissey and 8-year-old Elizabeth Collins.

Breault said the boater is not a suspect but that investigators "really do need to talk with the person." The boater has not voluntarily come forward to speak with investigators, who for days have urged the public to step forward to tell what they know. The girls' bikes were found near the lake.

Breault said investigators still believe the two girls are alive. 

Law enforcement officials will likely expand their search for the children now that their disappearance is considered an abduction case, experts said.