RedactedNarrative: According to witnesses vessel #2 dropped anchor in front of vessel #1 with adequate space.  Very quicked Vessel #2 floated backwards towards vessel #1 and collided for a few minutes causing property damage to.  They moved to a vacant mooring and secured.  Vessel #2 took off when a caretaker came and inquired about a possible collision.  A witness took photos and forwarded to owner of vessel #1.  Improper anchoring cause of accident.