The Pentagon is investigating the high likelihood that an explosion in southern Iran that destroyed a home hosting a wedding celebration was caused by a U.S. bomb that missed a nearby target, a person familiar with the operation said. The strike on the home, which Iranian officials said killed at least four civilians and injured dozens more, was part of a larger wave of attacks on Tuesday in southern Iran, described by U.S. officials as retaliation for increased threats to U.S. troops and commercial shipping.