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The USS Samuel B. Roberts (FFG-58) strikes a naval mine in the Persian Gulf, while deployed on Operation Earnest Will during the Tanker War phase of the Iran-Iraq War.

April 16 - Israeli commandos kill the PLO's Abu Jihad in Tunisia.

April 16 - In Forlì, Italy, the brigate rosse kill Senator Roberto Ruffilli, an advisor of Prime Minister Ciriaco de Mita.

April 18 - United States Navy retaliates for the Roberts mining with Operation Praying Mantis, in a day of strikes against Iranian oil platforms and naval vessels.

April 25 - In Israel, Ivan Demjanjuk is sentenced to death for war crimes committed in World War II. He was accused by survivors of being the notorious guard at the Treblinka extermination camp known as "Ivan the Terrible". The conviction is later overturned by the Israeli Supreme Court.

April 28 - Aloha Flight 243 loses several yards of its upper fuselage while in flight, killing one.

April 30 - World Expo '88 opens in Brisbane Queensland, Australia.

May 4 - PEPCON disaster in Henderson, Nevada: A major explosion at an industrial solid-fuel rocket plant causes damage extending up to 10 miles away, including Las Vegas's McCarran International Airport.

# May 14 - Bus collision near Carrollton, Kentucky: A drunk driver going the wrong way on Interstate 71, hits a converted school bus carrying a church youth group from Radcliff, Kentucky. The resulting fire kills 27, making it tied for 1st in the U.S. for most fatalities involving 2 vehicles to the present day. Coincidentally, the other 2-vehicle accident involving a bus that also killed 27 occurred in Prestonsburg, KY 30 years prior.

May 14 - Wimbledon wins the English FA Cup after beating Liverpool 1–0 at Wembley. The southwest Londoners had pulled off one of the greatest upsets in the history of English football, as they had been top division members for just 2 years and had joined the Football League only 11 years earlier. Liverpool, meanwhile, had won a total of 30 major trophies including 17 league titles.