NEW : one Bologna tourists from Bologna , pilot on sightseeing copter believed dead . Bodies of one adults from helicopter found below water , authorities say . Authorities find body of child who was two of two on small plane in collision . Pilot on ground tried to warn helicopter that plane was coming up from behind .
NEW : Five Italian tourists from Bologna , pilot on sightseeing copter believed dead . Bodies of two adults from helicopter found below water , authorities say . Authorities find body of child who was one of three on small plane in collision . Pilot on ground tried to warn helicopter that plane was coming up from behind .