Kauhajoki school shooting: Matti Saari kills 10 people before committing suicide.

Hurricane Jeanne: At least 1,070 in Haiti are reported to have been killed by floods.

The first public version of the web browser Mozilla Firefox ("Phoenix 0.1") is released.

Qantas Flight 1 overruns the runway in Bangkok during a storm. Although some passengers only receive minor injuries, it is still the worst crash in Qantas's history since 1960.

NASA announces that it has lost contact with the Mars Climate Orbiter.

A large Provisional Irish Republican Army bomb destroys forensic laboratories in Belfast.

José Canseco of the Oakland Athletics becomes the first member of the 40-40 club.

Jim Deshaies of the Houston Astros sets the major-league record by striking out the first eight batters of the game against the Los Angeles Dodgers.

Saint Kitts and Nevis joins the United Nations.

Gulf Air Flight 771 is bombed, killing all 117 people on board.

Gerrie Coetzee of South Africa becomes the first African boxing world heavyweight champion.

Juan Perón returns to power in Argentina.

Philippine President Ferdinand Marcos announces over television and radio the implementation of martial law.

The Chicago Eight trial opens in Chicago.

The Lincoln Center for the Performing Arts in New York City opens with the completion of the first building, the Philharmonic Hall (now Avery Fisher Hall) home of the New York Philharmonic.

The {{MS|Princess of Tasmania}}, Australia’s first passenger roll-on/roll-off diesel ferry, makes her maiden voyage across Bass Strait.

Iowa farmer and corn breeder Roswell Garst hosts Soviet premier Nikita Khrushchev.

Richard Nixon makes his "Checkers speech".

World War II: The so-called Salò Republic is born.

World War II: First day of the September Matanikau action on Guadalcanal as United States Marine Corps forces attack Imperial Japanese Army units along the Matanikau River.

World War II: The first gas chamber experiments are conducted at Auschwitz.

Mobilization of the Czechoslovak army in response to the Munich Crisis.

The Kingdom of Hejaz and Nejd is renamed the Kingdom of Saudi Arabia.

In Washington D. C., Charles Evans Hughes signs the Hughes-Peynado agreement, that ends the occupation of Dominican Republic by the United States.

''The Phantom of the Opera'' (original title: ''Le Fantôme de l'Opéra''), a novel by French writer Gaston Leroux, is first published as a serialization in Le Gaulois.

University of Alberta in Alberta, Canada, is founded.

Norway and Sweden sign the "Karlstad treaty", peacefully dissolving the Union between the two countries.

''Nintendo'' Koppai (Later ''Nintendo'' Company, Limited) is founded by Fusajiro Yamauchi to produce and market the playing card game Hanafuda.

Grito de Lares ("Lares Revolt") occurs in Puerto Rico against Spanish rule.

The Russian warship Lefort capsizes and sinks during a storm in the Gulf of Finland, killing all 826 aboard.

Neptune is discovered by French astronomer Urbain Jean Joseph Le Verrier and British astronomer John Couch Adams; the discovery is verified by German astronomer Johann Gottfried Galle.

The Knickerbockers Baseball Club, the first baseball team to play under the modern rules, is founded in New York.

Tripolitsa, Greece, falls and 30,000 Turks are massacred.

Lewis and Clark return to St. Louis after exploring the Pacific Northwest of the United States.

Second Anglo-Maratha War: Battle of Assaye between the British East India Company and the Maratha Empire in India.

American Revolution: British Major John André is arrested as a spy by American soldiers exposing Benedict Arnold's change of sides.

American Revolution: a squadron commanded by John Paul Jones on board the {{USS|Bonhomme Richard|1765|6}} wins the Battle of Flamborough Head, off the coast of England, against two British warships.

First commencement exercises occur at Harvard College.

The ''Merchant Royal'', carrying a treasure worth over a billion US dollars, is lost at sea off Land's End.

Battle of Blore Heath, the first major battle of the English Wars of the Roses, is fought at Blore Heath in Staffordshire.

Battle of Kherlen, the second significant victory over Ming China by the Mongols since 1368.

Concordat of Worms.