ELLIOT SPAGAT, Associated Press Writer
CALEXICO, Calif. (AP) " Aftershocks continue to jolt Southern California in the wake of a powerful weekend earthquake in Mexico.
Calexico, Calif., police Lt. Jesus Serrano says no injuries have been reported in the border town, but windows shattered, a few bricks fell and some cracks appeared in century-old buildings. Police have cordoned off downtown and businesses are closed Monday.
Calexico is the U.S. area hardest hit by Sunday's 7.2-magnitude quake in Mexico that killed two people and injured at least 100, including one person in the California town of El Centro.
Several aftershocks hit Monday morning, including a 5.1-magnitude temblor that struck at about 4:15 a.m. Monday near El Centro.
THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.
CALEXICO, Calif. (AP) " Police closed off the downtown of this U.S. border city after a powerful earthquake struck just inside Mexico, damaging prewar buildings not updated to handle strong quakes.
Businesses in Calexico, the U.S. area hit hardest by the Sunday afternoon quake, were being guarded by police and downtown will remain closed until further notice, Calexico police Lt. Gonzalo Gerardo said.
Residents gathered in the streets to trade news of the damage caused by the 7.2-magnitude quake. Bricks had fallen from buildings, some windows were shattered and some building walls had large cracks.
"It felt like I was in a canoe in the middle of the ocean," Rosendo Garcia, 44, said of the temblor, which struck at 3:40 p.m., centered 19 miles south of Mexicali.
Garcia said that five homes at his trailer park were seriously damaged.
His wife, Elvia Garcia, 47, said her refrigerator door flew open and all the food fell out. Her plates, TV and computer all smashed to the floor.
Seismic waves from the temblor rolled north into Southern California, damaging Calexico and alarming residents from San Diego to Santa Barbara. Buildings shook as far away as Phoenix and Las Vegas, but most of the U.S. damage appeared to be limited to California's southeastern Imperial Valley.
There were no reports of U.S. deaths or injuries, but at least two people died in Mexico.
Authorities said the strong quake was followed by many smaller aftershocks, including five with magnitudes between 5.0 and 5.4 and all centered in Mexico. A Monday morning magnitude-4.8 aftershock was centered between El Centro, Calif., and Imperial, Calif.
In Nevada, the quake was felt in the fire and medical dispatch center in downtown Las Vegas, but there were no reports of damage or injuries, according to Tim Szymanski, a spokesman for Las Vegas Fire and Rescue.
Jacqueline Land said her king-sized bed in her second-floor Phoenix-area apartment felt like a boat gently swaying on the ocean.
"I thought to myself, 'That can't be an earthquake. I'm in Arizona,'" she said.
In Yuma, Ariz., near the California line and the Mexican border, Police Department spokesman Clint Norred said police responded to a lot of business alarms that the quake tripped, but there were no reports of real damage.
"In my house, it knocked a couple of things off the wall" and cut power for 15 minutes, he said.
Calexico was concerned about the effect of aftershocks on the buildings, some of which had 2-inch-wide wall cracks.
"I was out there looking at the cracks and saying this could come down anytime," Gerardo said.
Three power lines were downed, a gas leak forced a brief evacuation of about 30 homes, and residents were removed from a senior living center built in the early 1900s, he said. Electricity was restored to the city's southeast area after about four hours.
Power outages affected more than 5,300 Southern California Edison customers but the majority had only 30 seconds of flickering lights, said spokeswoman Lauren Bartlett.
Several hundred had longer outages but only 25 were still out by mid-evening.
The quake was felt at the San Onofre Nuclear Generating Station San Clemente but the ground movement was not strong enough to set off the seismic alert that would shut the plant down, said SoCal Edison spokesman Gil Alexander.
Thoroughbreds at Santa Anita Park in Arcadia were in the middle of a race when the quake hit, and track announcer Trevor Denman noted the jolt in his call of the race.
"I'd say we started shaking at about the half-mile pole," Denman said. "It seemed like it was just going on and on."
None of the jockeys in the race noticed the quake, track spokesman Mike Willman said.
All rides at Disneyland were shut down and inspected for damage, but were operating again by Sunday night. The park remained open all day.
For many across Southern California, the tremor interrupted Easter celebrations.
"It went for a really long time. I was surprised," said Long Beach resident Gail Holtan. "Everybody just sat real calm and rode it out."
The last quake of similar size in Baja California or Southern California was the 7.2 Landers earthquake in 1992, she said.
Associated Press Writers Chris Weber, Andrew Dalton and John Antczak in Los Angeles and John S. Marshall in San Francisco contributed to this report.
Copyright 2010 The Associated Press.