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Donald Trump took to Twitter to condemn the deadly violence overseas in the last 24 hours. This comes as he engages in a Twitter war with former President Bill Clinton. CNN's Jessica Schneider reports.

State Department spokesman John Kirby reacts to Russia implying that the West was tied to the assassination of the Russian ambassador to Turkey.

Paul Cruickshank reports on the latest Berlin Christmas market attack news.

ISIS says one of it's 'soldiers' was at the wheel of the truck that rampaged through a Berlin Christmas market. Fred Pleitgen reports.

A 911 call captures the moment a woman lost her grandson after an apparent road rage incident in an Arkansas mall parking lot.

iFixit took apart Apple's new wireless headphones. Here's what they found.

Even after her suicide, the family of Brandy Vela says the teenager is still being harassed by online bullies. HLN's Erica Hill spoke with Vela's father and sister.

Dr. Ashish Jha talks to HLN's Erica Hill about the revelation he found after studying a national sample of older Americans and their doctors.

Crowds gathered to mourn the lives lost when a truck plowed into a Berlin Christmas market, killing 12.

The Transit Elevated Bus was unveiled as a test project to help ease China's legendary traffic jams by cruising over cars. Now it stands idle.

VistaJet is the private jet company for business travelers with the deepest of pockets. Their model is different, but is it sustainable? CNNMoney's Vanessa Yurkevich goes on board to find out.

Donald Trump appears on stage at the Republican National Convention for the first time as the presumptive Republican presidential nominee and the crowd goes wild.

CNN political commentator Van Jones gets emotional during a panel discussion of a possible Donald Trump presidential upset.

The Associated Press photographer who captured images of slain Russian envoy Andrey Karlov talks to CNN's Nic Robertson about the moment the gunman opened fire.

Former senator Rick Santorum told CNN's John Berman he does not know why President-elect Donald Trump has declined to receive daily intelligence briefings.

iFixit took apart Apple's new wireless headphones. Here's what they found.

The Michigan attorney general announced four more officials have been charged for their role in the water crisis in Flint, Michigan.

"Rogue One" star Alan Tudyck shows off the different British accents he tried for his role as K-2SO.

Federal prosecutors released the search warrant application the FBI used that led to the probe into Hillary Clinton's emails, which took place just weeks before the presidential election.

Thomas White, Syria Response Dir., Norwegian Refugee Council, talks to CNN's Cyril Vanier about urgent needs of the refugees who have fled Eastern Aleppo.