The third teen was arrested later Monday, following the arrests of the other two teens by the Stratford Police, said Stratford Police Capt. Frank Eannnotti.
Eannotti declined to comment more on the case, including whether the three are suspected in the recent arson fire of construction trailers at Silver Sands State Park.
The names of the youths were not immediately released because they were juveniles at the time the fires were set.
The third teen was charged with conspiracy to commit arson, criminal trespass, burglary, and criminal mischief.
The investigation is ongoing and more arrests are expected, Eannotti said.
This continues to be a developing story. Check back to Daily Voice for updates.
Click here to follow Daily Voice Stamford and receive free news updates.