On this day — April 21

killing all 53 on board.

hotels, and other locations in Sri Lanka on Easter Sunday, killing at least 269.

Michigan switches its water source to the Flint River, beginning the ongoing Flint water crisis which has caused lead poisoning in up to 12,000 people, and at least 12 deaths from Legionnaires' disease, ultimately leading to criminal indictments against 15 people, five of whom have been charged with involuntary manslaughter.

Amsterdam, in the Netherlands, killing one person and injuring 116 others.

Ukraine, by Ukrainian president Viktor Yanukovych and Russian president Dmitry Medvedev; it was unilaterally terminated by Russia on March 31, 2014.

killing 74 people and wounding 160.

Bolivia, sentences former dictator Luis García Meza to 30 years in jail without parole for murder, theft, fraud and violating the constitution.

In Beijing, around 100,000 students gather in Tiananmen Square to commemorate Chinese reform leader Hu Yaobang.

killing 106 people.

The Sword, and the Arm of the Lord surrenders to federal authorities in Arkansas after a two-day government siege.

as Xuân Lộc, the last South Vietnamese outpost blocking a direct North Vietnamese assault on Saigon, falls.

the fifth NASA Apollo Program crewed lunar landing.

Colonel George Papadopoulos leads a coup d'état, establishing a military regime that lasts for seven years.