RedactedNarrative: EPO was given information (5-21) that an anonymous caller called Glocester town police to report a boating accident that occurred on May 17 at approximately 9pm on Waterman Lake. The caller reported that accident involved two vessels.  The caller also reported that one of the operators sustained a head injury and sought medical attention on 5-18. According to Officer’s report Operator1 was operating a Pontoon and Operator2 was operating a Jon Boat. Off. later met with Operator1 at Inland Marine which is owned by both Operator2 and Operator1. Off. asked Operator1 if he was involved in a boating accident on 5-17 with his brother on Waterman Lake. Operator1 stated that around 8:45pm (5-17) he was operating his pontoon boat in a southerly direction at the lake. As he was cutting around the peninsula he observed his brother who was operating a Jon Boat heading in the opposite direction with no navigational lights on. The two boats then collided starboard side to starboard side. He also stated that there were no injuries to either operator. Off. photographed and observed that both boats sustained substantial damage.