About 5 fire engines convened at the intersection of Hylan Blvd near New Dorp Ln in search of the source of a mysterious explosion. Car alarms were set off by the explosion and it shook up the person I spoke to via cell phone. Police/fire are having trouble finding source of explosion. This is near the Atlantic Ocean, and could be a plane crash, but no flames on the horizon. Friend questioned police/fire but they did not know the source. Police and fire units were in the area trying to find source.