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The former head of the IRS said Tuesday that he was aware of some aspects of his agency's targeting of conservative groups in the spring of 2012, and took what he called the correct action of ensuring the situation would be independently reviewed.

Three university researchers working on medical technology are facing federal charges -- and up to 20 years in prison if convicted -- for allegedly taking Chinese money for their U.S.-funded research, according to federal authorities.

Damage assessments show that the Oklahoma tornado was an EF5 -- meaning it had winds of 200 mph or greater.

A massive tornado struck a suburb of Oklahoma City on Monday afternoon. Details of the destruction are coming in thick and fast from CNN crews, our affiliates and witnesses.

Amtrak service resumed between New York and New Haven, Connecticut, Tuesday afternoon, the national train operator announced in a statement, five days after a derailment on one of the busiest tracks in the country injured more than 70 people.

The Army has suspended the top general at Fort Jackson in South Carolina due to allegations of adultery and assault, an Army spokesman says.

Wednesday's special edition of CNN Student News focuses on the scope and impact of this week's devastating tornado in Oklahoma.

A day after local police said they are ending their 3½-year search for a missing Utah woman, her father and his attorney told reporters that federal agents and private investigators are now on the case.

Military forces used thermal imaging technology and other specialized equipment to help search for victims buried in rubble from Monday's devastating tornado outside Oklahoma City.

Terrified children, teachers' heroics, no shelter: Inside a tornado-ravaged school elementary school in Moore, Oklahoma

Whether Jodi Arias lives or dies is now in the hands of a jury. She will address its members directly Tuesday morning. Arias said earlier this month that she would rather die than endure a lifetime behind bars.

The aftermath: Parents screamed for their missing children. Kids cried for their parents. Joy even amid devastation.

After years of controversy, the latest version of the "psychiatric bible" -- the Diagnostic and Statistical Manual of Mental Disorders -- has been released.

A tornado is a funnel-shaped cloud that forms under thunderclouds and contains rapidly rotating air.

Kids screamed for their parents and parents hollered their children's names, walking and searching in panic in the parking lot of Briarwood Elementary in Moore, Oklahoma, Monday. The tornado that wrecked their town had just left. The sky behind them was still dark. Rain fell in a light mist.

This was no ordinary plane ride.

The system that spawned Monday's massive, deadly tornado in Oklahoma, in addition to several twisters Sunday, isn't over yet. Fifty-three million Americans could face severe weather Tuesday.

An American lawyer based in Moscow who used to work at the U.S. Embassy there was expelled from Russia two weeks ago, his law firm said on Monday.

A series of deadly storms that pummeled Arkansas, Missouri and other states this week reminds us that tornado season is upon us once again.