Today (April 15) in history:

1912 - The British passenger liner RMS Titanic sinks in the North Atlantic at 2:20 a.m. after hitting an iceberg. Only 710 of 2,224 passengers and crew on board survive.

1936 – First day of the Arab revolt in Mandatory Palestine.

1945 – Bergen-Belsen concentration camp is liberated.

1955 – McDonald's restaurant dates its founding to the opening of a franchised restaurant by Ray Kroc, in Des Plaines, Illinois.

1970 – During the Cambodian Civil War, massacre of the Vietnamese minority results in 800 bodies flowing down the Mekong river into South Vietnam.

1989 – Upon Hu Yaobang's death, the Tiananmen Square protests of 1989 begin in China.

2013 – Two bombs explode near the finish line at the Boston Marathon in Boston, Massachusetts, killing three people and injuring 264 others.

2019 – The cathedral of Notre-Dame de Paris in France is seriously damaged by a large fire.