Ok, so I already reported this in game, however, I could not get the entirety of my message within the limited spacing provided so I'm posting this here as well.
This was recorded in the Scourge Imperial City Sewers, Ebonheart Pact home base, directly in front of the banking NPC, on PS4 NA server. Somehow, this player has found a way into the base and is also able to kill players as they try and access the bank. Needless to say, this is completely unacceptable as goodness knows how many people this player has robbed of their Tel Var stones with this exploit, to say nothing of the amount of Alliance points he is racking up due to the number of people he's killing.
This needs to be handled ASAP as it's a clear exploit within the game.