The search for Celina Cass, the missing 11-year-old New Hampshire girl, is intensifying after nearly 6 entire days since she was last seen.

Since then, the police have spoken to every individual from Celina Cass' neighborhood in a small town called Stewartstown, which borders Canada and Vermont, said New Hampshire Assistant Attorney General Jane Young, reported ABC News.

New Hampshire has asked neighboring states for manpower and equipment to help with the search. 

Police forces in Massachusetts, Vermont, and Connecticut have "shown an overwhelming support for us in this investigation" and provided "additional resources," said Lt. Robert Quinn of New Hampshire State Police, reported ABC News.

Cass was last seen at 9 p.m. on Monday, July 25, using a computer at her home. 

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. 

The FBI and an anonymous member of Cass' community are offering a combined $30,000 reward for information leading to the whereabouts of the missing fifth grader.

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

Below are a flyer for the missing Celina Cass taken from the "Help Find Celina Cass" Facebook page and other relevant photos.