Early in the 9 o’clock hour this evening, Branchville Engine 811B was dispatched to Company 34’s area to investigate an automatic fire alarm at the Casa of Maryland in the 8100-blk of 15th Avenue. Upon arrival with Truck 834, crews investigated and discovered person/persons unknown had pulled the alarm system. Regardless, we never know and always treat all alarms as if they are a true emergency. The alarm was reset and units returned to service.