Flooding in Porto Alegre

• Flooding (pictured) in Rio Grande do Sul, Brazil, leaves more than 100 people dead and at least 130 others missing.
• Kyren Wilson wins the World Snooker Championship.
• In horse racing, Mystik Dan wins the Kentucky Derby.
• Following the Solomon Islands general election, Jeremiah Manele becomes the prime minister.
• Acting prime minister of Haiti Ariel Henry resigns, and the Transitional Presidential Council is sworn in.

May 9: Europe Day in the European Union; Liberation Day in the Channel Islands (1945)

Hotel Polen fire

• 1877 – An earthquake struck northern Chile, leading to the deaths of 2,385 people, mostly victims of the ensuing tsunami, as far away as Hawaii and Fiji.
• 1944 – World War II: The Japanese Take Ichi convoy arrived at Halmahera in the Dutch East Indies after losing many ships and thousands of troops to Allied attacks while attempting to carry two divisions of troops from China to New Guinea.
• 1977 – The Hotel Polen in Amsterdam was destroyed by fire (pictured), leaving 33 people dead.
• 1980 – Part of the Sunshine Skyway Bridge in Florida collapsed after a pier was struck by the MV Summit Venture, killing 35 people.
• 2001 – Police at the Ohene Djan Stadium in Accra, Ghana, fired tear gas to quell unrest at a football match, leading to a stampede that killed 126 people.