Iran's Revolutionary Guards vowed on Sunday to exact "deadly and unforgettable" vengeance for a shooting attack on a military parade that killed 25 people, including 12 of their comrades, and Tehran accused Gulf Arab states of backing the gunmen.

U.S. Ambassador to the United Nations Nikki Haley on Sunday dismissed Iran's assertion that Washington and its Gulf allies were to blame for a deadly parade attack and said Tehran should look closer to home.

OPEC's leader Saudi Arabia and its biggest oil-producer ally outside the group, Russia, ruled out on Sunday any immediate, additional increase in crude output, effectively rebuffing U.S. President Donald Trump's calls for action to cool the market.

British opposition leader Jeremy Corbyn said on Sunday he would back a second Brexit referendum if his Labour Party votes to pursue the move, heaping pressure on Prime Minister Theresa May whose plans for a divorce deal with the EU have hit an impasse.

When a grainy video of standup comedian Hannibal Buress making a joke about Bill Cosby's rape allegations on an October night in 2014 went viral, the rallying cry of #MeToo was years away.

Volkswagen's Porsche will stop offering diesel versions of its cars, the unit said on Sunday, sharpening its focus on hybrid and battery-powered vehicles instead.

(This new version of the story corrects number of dead in lede.)

Pope Francis said on Sunday that society should be vigilant for "any whiff" of resurgent anti-Semitism, calling for new generations to be taught the horrors of the Holocaust.

Unemployment near a 20-year low screams at the U.S. Federal Reserve to raise interest rates or risk a too-hot economy. The bond market, not far from a state that typically precedes a recession, says not so fast.

A deadly assault on an Iranian Revolutionary Guards parade dealt a stunning blow to Iran’s security establishment, which has often said it can repel any threat no matter how big, even from the United States and its chief Middle East ally Israel.