The Coast Guard has issued a safety warning for commercial boat operators, saying they should monitor the amount of unsupervised phone charging on the boat in the wake of a boat fire off the coast of California that killed 34 people. USA Today reported that a preliminary report into the fire near Santa Cruz Island could come out as soon as Thursday, according to the the National Transportation Safety Board. While the report will likely not include a cause, it will examine how batteries and electronics were stored. The Coast Guard urged those operating a boat to "reduce potential fire...