Coast Guard Cutter Kittiwake file photo HONOLULU — The Coast Guard responded to a collision of two vessels approximately 20 miles southeast of Oahu, Wednesday. Commercial fishing vessel, Helen, reportedly collided with the Italian-flagged Liquid Propane Gas tanker, Pertusola, carrying 2,300 metric tons of propane. At 1:52 p.m., Coast Guard Sector Honolulu watchstanders received a report from the...