WATERVILLE (AP) — About 35 people demonstrated outside the Waterville Police Department on Saturday to press for law enforcement officials to bring charges in the case of missing Maine toddler Ayla Reynolds.

Trista Reynolds and her family participated in the event on Saturday in the city where her 22-month-old daughter was reported missing on Dec. 17, 2011. The girl’s father, Justin DiPietro, told investigators that he last saw the youngster the night before when he put her to bed.

Investigators believe the toddler is dead and the victim of foul play. They also have said that DiPietro, his then-girlfriend and his sister, who were at the house the night before she was reported missing, know more than they’ve told investigators.

“They should at least be charged with endangering the welfare of a child,” said Nancy Emery, 60, of Waterville, who attended Saturday’s demonstration. She told the Morning Sentinel that her own daughter disappeared when she was 11 so she empathizes with the Reynolds’ family.

Saturday’s demonstration also drew some people from out-of-state, including a group from Erie, Pa.

Heather Garczynski of the group Justice Seekers, who is attending graduate school for criminology, said she believes there is probable cause to file charges in the case.

Police did not interact with the protesters other than to ask some people to move their cars.

Trista Reynolds says that her family has suffered endlessly and that the only consolation is knowing that the person responsible will be one day brought to justice.

She said in September that her daughter’s blood was found in places throughout the home where the girl was last seen.

Authorities had previously confirmed that some of Ayla’s blood was found in the Waterville home where DiPietro lived with his own mother.