According to police officials cited by Armenian news websites, the apparently drunk man allegedly threw a hand-grenade and fired shots from inside the building where only a cleaner and a security guard were at the moment of the attack.
Both were reportedly evacuated and were unscathed.
A representative of the police’s press department told local media that the attacker had made no demands and shot himself as law-enforcement officers were trying to negotiate with him.
No casualties were reported among the police.
The attacker was later identified as 36-year-old Eduard Markarian, a former member of Masis’s municipal assembly.
His motives for carrying out an apparent armed intrusion were not clear immediately as police said more details would be reported later.