#CNNWorld

For more than 28 hours, CNN's Arwa Damon and photojournalist Brice Laine were with Iraqi special forces during their push into ISIS-held Mosul.

A mass grave containing the remains of about 100 beheaded civilians has been discovered inside a school in a town south of Mosul, Iraq's military said in a statement Monday.

For more than 28 hours CNN senior international correspondent Arwa Damon and photojournalist Brice Lane were with Iraqi special forces as they pushed forward into ISIS-held Mosul on Friday. It was a new phase of the liberation operation -- switching from villages and open terrain to a dense city that a well-equipped ISIS is determined to defend.

In a red brick building on a 19th-century Russian czarist military compound in Tallinn, Estonia, a team of cyber experts is analyzing the hacking of the Democratic National Committee and how a Western democracy can legally respond.

A woman arrested by police in Brisbane, Australia, shocked officers by handing over a zipped bag containing a baby koala.

A rising tide of humanity ebbed east from Mosul on Thursday as Iraqi forces entered the ISIS-controlled city for the first time in two years and engaged in up-close battles with the militants.

South Korean President Park Geun-hye's two apologies have not quelled some Koreans' anger over an abuse-of-power scandal engulfing her administration.

The US presidential election. It's exhilarating, it's exhausting, but it's also inexplicably complicated -- even for us natives. Here's everything you need to know to become an insta-pundit.

US-backed militia groups in Syria said they're launching an operation to seize ISIS' de facto capital, Raqqa, in coordination with international coalition forces. According to the statement, the Syrian Democratic Forces established a joint operations center Saturday night for the military campaign "Euphrates Rage," which includes multiple Arab, Kurdish and Turkmen militia groups. The operation was announced just days after Iraqi forces entered the city of Mosul, where they are now in a fierce battle with ISIS militants. There has been no official comment by the US-led coalition regarding the launch of a new Raqqa offensive.

Security forces have arrested the alleged leader of the Basque separatist group ETA, Spain's interior ministry said, in what is described as a "hard blow" to the militant organization.

If a battle in Mosul that CNN's Arwa Damon and Brice Lane were caught in is any indication, the push to take back the Iraqi city will only grow more difficult.

CNN's Arwa Damon, a longtime war correspondent, describes a harrowing night surrounded by ISIS forces.

One of the Chibok schoolgirls kidnapped by Boko Haram in Nigeria in 2014 was found Saturday by the Nigerian army, the army said.

The US military is investigating an operation near the Afghan city of Kunduz that left at least 30 civilians and two American service members dead this week.

Iraq's federal police forces and army troops attacked the ISIS-held town of Hammam al-Alil, south of Mosul, on Saturday as Iraqi-led coalition forces seek to drive back ISIS militants from their last major Iraqi stronghold.

Online trolls angered by this week's bombshell UK court ruling that the Brexit process cannot begin until Parliament has had its say have directed rape and death threats at Gina Miller, the woman behind the legal case.

There are few more vulnerable spots along NATO's entire perimeter than the Suwalki Gap, an about 60-mile stretch of territory and a critical rail line separating Poland from Lithuania, linking Russian Kaliningrad with Putin's staunch ally Belarus. If Vladimir Putin takes comfort in NATO's waffling, or doubts US willingness to spring to the defense of the Baltic republics, it's here any shootout between NATO and Russia could start. Or even World War III.

POTUS 45 won't have much time to celebrate.

A car bomb targeting a police station in southeastern Turkey has killed seven civilians and two police officers, according to state-run Anadolu news agency.