Samsung Electronics Co said it was investigating reports that one of its flagship Galaxy S III smartphones exploded in a user's car in Ireland. Samsung launched its latest Galaxy S, the strongest rival for Apple's iPhone, in Europe on May 29 and in the United States on Thursday. It plans to roll out the device in its lucrative home market in South Korea on Monday. A Dublin-based consumer posted comments and photos on a website on Wednesday (http://www.boards.ie/vbulletin/showthread.php?p=79312161&utm_source), saying his Galaxy phone "exploded" while mounted on his car dashboard. He wrote that while he was driving, "suddenly a white flame, sparks and a bang came out of the phone." "There's no confirmation it was a fault with the phone. It may actually have been caused by a combination of my car mount and my car's heating system," he added.