Couric In Colorado

Massive twister caught on tape by storm-chasers as it touches down near hard-hit Shawnee, Oklahoma, where at least one man was killed.

Small town 45 miles northeast of Oklahoma City sees heavy damage as powerful storms spawn twisters

One of several twisters that ripped through Oklahoma and Kansas Sunday night destroyed several mobile homes in a trailer park 35 miles southeast of Oklahoma City.

A train derailment has led to a collision on New York's Metro North commuter train line in Fairfield, Conn. at the height of evening rush hour. There are early indications of injuries. Service between New York and Boston has been suspended indefinitely.

Drones have been primarily been known for their role in American foreign policy, but as Brian Montopoli reports, the unmanned vehicle systems are beginning to be integrated into everyday American life.

During the final penalty phase in the trial of convicted killer Jodi Arias, the siblings of Travis Alexander gave emotional testimony to jurors who will decide whether Arias will be sentenced to death.