Aftershock on U.S.-Mexico border as Sen. Boxer tours

CALEXICO, Calif. -- A moderate aftershock rattled the California-Mexico border even as U.S. Sen. Barbara Boxer was getting a firsthand look at Calexico, where a larger magnitude-7.2 quake did damage last weekend.

The magnitude-5.3 aftershock hit Thursday around 9:45 a.m. and was centered near Guadalupe Victoria, a farming village about 30 miles southeast of Mexicali, Mexico.

There were no reports of injuries or damage.

Calexico Mayor David Ouzan says Boxer was walking down his city's main street when the aftershock hit, and that windows could be seen shaking.

Also Thursday, California Gov. Arnold Gov. Schwarzenegger issued an executive order providing more assistance for Imperial County.

U.S. Rep. Bob Filner, D-Chula Vista, said damage in Imperial County alone likely will exceed $100 million and reported that at least 800 homes were severely damaged.

Sunday's quake caused extensive damage on both sides of the border and killed two people in Mexicali.