( CNN ) -- A developmentally delayed teen girl was found Thursday with a person of interest in Rhode Island , three days after she disappeared from a public library in Massachusetts , police said . `` I want to emphasize the fact that she is safe , she is unharmed , she is OK , '' Medfield Police Chief Robert Meaney said Thursday morning . Police say Brittany Thompson , 17 , of Medfield was last seen Monday leaving the Medfield Public Library with a man . `` Medfield Police Department received a call at approximately 7:30 this morning from the Coventry , Rhode Island , Police Department that Brittany and a male person of interest , that we were starting to look at as part of our conversation , had been located walking down a road in Coventry , Rhode Island , '' Meaney said Thursday morning . The man with her was as an adult , older than Thompson , with an address in Missouri , Meaney said . `` I do n't believe the parents know who this individual was , '' he added . The person she was seen leaving with Monday was a heavyset man , wearing a `` Sons of Anarchy '' T-shirt and slicked-back hair , according to a Massachusetts State Police statement released this week . `` I do not know if the person she was found with was the person on the surveillance video ... that 's one of the things we are trying to make sure of , '' Meaney said . `` In the videotape , she looks like she walks out of the library voluntarily , '' he told CNN on Wednesday . Meaney said Thompson 's family headed to Coventry and were probably reunited with Thompson early Thursday . No charges have been filed , but an investigation is ongoing . Police are not releasing the name of the man considered a person of interest . `` There 's a lot of pieces to the puzzle that we have not yet put together , '' Meaney said . Thompson was not taken to a hospital when she was found and did not appear to have any injuries , he said .
` ` She is safe , she is unharmed , she is OK , '' police chief says of Brittany Thompson . She was last seen Monday leaving the Medfield Public Library with a man . It 's not known if the man Thompson was found with was the man she left the library with . She did n't appear to be hurt and was n't taken to a hospital when she was found , chief says .