On Aug. 26, 1968, the Democratic National Convention opened in Chicago; the four-day event was marked by a bloody police crackdown on anti-war protesters in the streets and a tumultuous nominating process that resulted in the choice of Hubert H. Humphrey for president.

Ten years ago

Iran’s hard-line president, Mahmoud Ahmadinejad, inaugurated a heavy-water production plant, a facility the West feared would be used to develop a nuclear bomb. Chad’s President Idriss Deby ordered California-based Chevron Corp. and Malaysian company Petronas to leave the country, saying neither had paid taxes. (The dispute over taxes was later resolved, with the two companies agreeing to pay $289 million.)

Five years ago

More than 2 million people along the Eastern Seaboard were ordered to move to safer ground as Hurricane Irene approached the coast. A Boko Haram sect member detonated a car loaded with explosives at the United Nations headquarters in Nigeria’s capital Abuja, killing 25 people and wounding more than 100 others.

One year ago

Alison Parker, a reporter for WDBJ-TV in Roanoke, Virginia, and her cameraman, Adam Ward, were shot to death during a live outdoor interview with Vicki Gardner, executive director of the Smith Mountain Lake Chamber of Commerce by Vester Lee Flanagan, a disgruntled former station employee who then fatally shot himself while being pursued by police. (Gardner was seriously wounded in the attack.)

— By The Associated Press