Historical timeline for April 28

CBS News releases evidence of the Abu Ghraib torture and prisoner abuse. The photographs show rape and abuse from the American troops over Iraqi detainees.

Port Arthur massacre, Tasmania: A gunman, Martin Bryant, opens fire at the Broad Arrow Cafe in Port Arthur, Tasmania, killing 35 people and wounding 23 others.

Whitewater controversy: President Bill Clinton gives a 41⁄2 hour videotaped testimony for the defense.

Former Central Intelligence Agency counterintelligence officer and analyst Aldrich Ames pleads guilty to giving US secrets to the Soviet Union and later Russia.

Space Shuttle Discovery launches on STS-39, the first unclassified shuttle mission for the United States Department of Defense.

Near Maui, Hawaii, flight attendant Clarabelle "C.B." Lansing is blown out of Aloha Airlines Flight 243, a Boeing 737, and falls to her death when part of the plane's fuselage rips open in mid-flight.

High levels of radiation resulting from the Chernobyl disaster are detected at Forsmark Nuclear Power Plant in Sweden, leading Soviet authorities to publicly announce the accident.

The West German news magazine Stern begins publishing excerpts from the purported diaries of Adolf Hitler, later revealed to be forgeries.

The President of Afghanistan, Mohammad Daoud Khan, is overthrown and assassinated in a coup led by pro-communist rebels.

The Red Army Faction trial ends, with Andreas Baader, Gudrun Ensslin and Jan-Carl Raspe found guilty of four counts of murder and more than 30 counts of attempted murder.

General Cao Văn Viên, chief of the South Vietnamese military, departs for the US as the North Vietnamese Army closes in on victory.

The Dark Side of the Moon by Pink Floyd, recorded in Abbey Road Studios goes to number one on the US Billboard chart, beginning a record-breaking 741-week chart run.

Vietnam War: US President Richard Nixon formally authorizes American combat troops to take part in the Cambodian campaign.

Charles de Gaulle resigns as President of France.

Vietnam War: Boxer Muhammad Ali refuses his induction into the United States Army and is subsequently stripped of his championship and license.

United States occupation of the Dominican Republic: American troops land in the Dominican Republic to "forestall establishment of a Communist dictatorship" and to evacuate US Army troops.

The Treaty of San Francisco comes into effect, restoring Japanese sovereignty and ending its state of war with most of the Allies of World War II.

The Sino-Japanese Peace Treaty (Treaty of Taipei) is signed in Taipei, Taiwan between Japan and the Republic of China to officially end the Second Sino-Japanese War.

Dwight D. Eisenhower resigns as Supreme Allied Commander of NATO in order to campaign in the 1952 United States presidential election.

The Hukbalahap are accused of assassinating former First Lady of the Philippines Aurora Quezon, while she is en route to dedicate a hospital in memory of her late husband; her daughter and ten others are also killed.