WEST STEWARTSTOWN, N.H. (CNN)—One week after 11-year-old Celina Cass was last seen, her body was found Monday by divers searching the Connecticut River, New Hampshire Senior Assistant Attorney General Jane Young said.
"We have brought Celina home, not the way we wanted to bring her home," Young said early Monday evening.
"Based on what we have seen visually, we are treating it as suspicious," Young said.
Celina's body was found around 10:30 a.m. Monday by divers from the New Hampshire Fish and Game Department near a hydroelectric plant outside West Stewartstown, New Hampshire, according to the attorney general's office.
Young described it as a "routine search because of the proximity to (Celina's) home," about one-quarter mile away. The site is also near the Canadian border, where the Connecticut River forms the border between New Hampshire and Vermont.
The discovery came one day after Celina's father pleaded for the safe return of the New Hampshire girl.
The father, Adam Laro, who said he was recovering after being recently released from a hospital, said Sunday he and others were "wondering where my daughter is" and hoping she was safe.
"Whenever you want to come home, Celina, Daddy will be here waiting for you," Laro said.
Celina was last seen in her room, at her computer, around 9 p.m. July 25, according to police. CNN affiliate WMUR reported that her parents told authorities the girl was gone when they went to wake her up Tuesday morning.
Since then, local, state and federal investigators had searched for her and for clues about her whereabouts "by air, by land, by water," Young said Sunday evening.
Young said on Monday that authorities, including FBI agents, had received nearly 500 tips prior to finding the girl's body.
She described investigators' focus Monday around Celina's home as "routine," after being asked about yellow crime tape there and the removal of a vehicle. The aim is to "determine if we have any evidence" in place's around where the girl was last seen alive.
And Young added that the discovery of the girl's body should help authorities "hone the investigation, so you will (still) see searches conducted in different areas."
An autopsy will be conducted on Celina's body on Tuesday morning in Concord, New Hampshire, said Young. The medical examiner will work to determine the cause of the girl's death.
CNN's Chuck Johnston contributed to this report.