Friday, April 4, 2003 at 00:09 JST YOKOHAMA — Multiple explosions were heard outside the U.S. Atsugi naval air station Thursday night in what the Japanese police suspect was a guerrilla attack by Japanese militants opposed to the Iraq war. The explosions, which were reported at around 10:40 p.m., occurred in the neighborhood of the main gate of the base in Ayase, Kanagawa Prefecture, police officials said. There were no reports of casualties or damage to properties. One store owner outside the main gate of the base said he heard two quick explosions and described the blast as "something like...