EVANSDALE (AP) — Two Iowa girls have been missing for a month, but the FBI says leads make investigators believe the girls are still alive.

Ten-year-old Lyric Cook and her cousin Elizabeth Collins, who has since turned 9, were reported missing July 13 from the Waterloo suburb of Evansdale. Their bikes were found at a nearby lake about four hours after their grandmother had last seen them.

The Des Moines Register says FBI spokeswoman Sandy Breault would not discuss the leads or say whether investigators believe the girls were kidnapped for ransom, abducted by a relative or abducted by a nonrelative.