The FBI and multiple state police forces are looking for Celina Cass, the 11-year-old 5th grader who disappeared a little over 6 days ago.

The New Hampshire State Police force has contacted state forces in Massachusetts, Vermont, and Connecticut, who have supported manpower and resources for the search. Cass' small town of Stewartstown borders Vermont and Canada.

The FBI is also involved in this case; it's offering a $25,000 reward for any information that could lead to her whereabouts.  Combined with a $5,000 contribution from a member of Cass' community, the reward totals $30,000.

So far, officials have received at least 150 tips, according to ABC. 

Authorities have talked to every individual in Cass' small neighborhood and picked through garbage for any and all clues.

They are also diving to local bodies of waters, flying over with helicopters, and employing all-terrain vehicles for the extensive search effort. 

"If we're not going to leave any stone unturned we have to look in bodies of water as well as land area," said Sgt. Brian Adams from New Hampshire Fish and Game, reported ABC.

Cass was last seen on Monday July 25 at 9:00 p.m. using a computer at her home.  She lived with her mother and stepfather.

"Whenever you want to come home, Celina, Daddy will be here waiting for you," said her biological father Adam Laro on Sunday, reported ABC.

Cass is 5' 5'', 95 pounds, and has hazel eyes and brown hair.  She was last seen wearing a pink pullover and blue shorts.

Anyone with information on her whereabouts should call the New Hampshire state police at 603-846-3333.  Any who sees her should immediately call 911.