91% of Lithuanian voters opted to join the European Union—the first former Soviet nation to do so.
India executes a series of nuclear weapons tests. The detonations raised fears of a nuclear conflict in the area and sparked international protests. On May 13, 1998, India officially declared itself a nuclear power.
56 football fans die in a stadium fire. During a match against Lincoln City, the wooden stands at Valley Parade football ground went up in flames. The exits were locked. A burning cigarette thrown into a waste bin has been determined as the probable cause of the disaster.