Mexico's Warning System Praised After 7.2 Quake

Centered near Acapulco, the earthquake damaged homes and older structures but it did not leave the trail of devastation that often comes with a quake that size. Experts told NBC4 that an early warning system alerted Mexico City over a minute before the earthquake hit. Conan Nolan reports from Pasadena for the NBC4 News at 6 p.m. on Friday, April 18, 2014.