Urban Farmers Grow Rooftop Crops

Tornado Twists Through Okla.

Twister ripped apart homes from Newcastle to Moore, a path of 12 miles.

Assessing the Injured from the Oklahoma Tornado

Hospital worker Brook Cayot discusses treating victims of the Oklahoma tornado.

Aftermath of the Oklahoma Tornado

Emergency and rescue workers rush to help survivors.

Father Reunited With Son After Oklahoma Tornado

Wheeler family describes the moment of joy when son returned home safely.

Tornado Rips Through Moore, Okla.

The National Weather Service says tornado had wind speeds up to 200 mph.

Rhode Island Student Disappears on Drive Home

Matthew Royer, 21, never arrived at his Pennsylvania home after leaving the University of Rhode Island.

Tornado Chasers Catch Outbreak on Tape

ABC News' Ginger Zee chases tornadoes during a large breakout of storms.

May 1999: Historic Okla. Tornado

EF-5 tornado killed 42 people in the Oklahoma City area.

Miller: 'I Did Not Mislead Congress'

IRS commissioner testifies on Capitol Hill following alleged targeting of conservative political groups.

Teenager's Invention Charges Cell Phone in Seconds

Eesha Khare, 18, won the Young Scientist Award at the Intel International Science and Engineering Fair.

Storm Chasers in a Tornado Outbreak

Veteran storm chaser Ginger Zee with the latest breaking news and storm developments.

Jodi Arias Judge Denies Attorneys' Request to Withdraw

Kirk Nurmi asked for a mistrial in the death penalty phase citing prosecutorial misconduct.

Aimee Copeland Gets Bionic Hands

Touch Bionics donated prosthetics to Georgia woman, 25, who lost her hands to flesh-eating bacteria.

Missing Student's Purse Found on George Washington Bridge

Page Aiello's family say the College of New Jersey senior was battling stress.