1921 - Ferruccio Ghinaglia - Pavia * 1 morto

http://www.pclavoratori.it/files/index.php?obj=NEWS&oid=4977

1970 - Philippine Airlines Flight 215 - Filippine * 36 morti

https://aviation-safety.net/database/record.php?id=19700421-0

2017 - Attacco base Shaheen - Afghanistan * 250 morti

https://www.theworldweekly.com/index.php/reader/view/magazine/2017-04-27/talibans-deadliest-attack-in-years-highlights-afghanistans-security-woes/9973/

1930 - Incendio prigione Ohio - USA * 322 morti

http://www.ohiohistorycentral.org/w/Ohio_Penitentiary_Fire

1987 - Strage stazione Bus Pettah - Sri Lanka * 150 morti

http://ricerca.repubblica.it/repubblica/archivio/repubblica/1987/04/22/strage-sri-lanka-bomba-fra-la-folla.html