Officials are investigating the cause of a fire in an abandoned hospital in Port Chester, but say squatters may be to blame.

The fire at the United Hospital building was reported around 9:15 a.m. Monday. Fire officials say it began as two separate fires that were started on the second floor in the old psychiatric ward.

People who live next to the hospital acknowledge there are people living inside it, but say they haven't noticed any problems.

The Port Chester fire chief told News 12 Westchester the area where the fire started was covered in writing, leading them to believe that squatters may have played a role. However, the investigation is ongoing.

The hospital closed down in 2005.