The Massachusetts State Fire Marshal's office says a fire at a bank of Tesla charging stations is believed to have been intentionally set and is being investigated as suspicious.

Upon arrival, firefighters saw seven chargers with heavy fire damage. After the Littleton Electric Light & Water Department cut power to the devices, they quickly extinguished the fire and notified the State Police Fire Investigation Unit assigned to the State Fire Marshal’s office.

Littleton police and firefighters were called to the Tesla Supercharger at about 1 a.m. Monday after a neighbor saw a fire burning at the station.