An earthquake rocked the border region of southern California Monday night.
The quake stopped a San Diego Padres baseball game for a few moments. San Diego's Petco Park swayed, but announcers urged the crowd to remain calm as they felt several aftershocks.
The 5.7-magnitude quake was centered about 85 miles east of San Diego. It struck at 9:26 p.m. PDT.
The quake was an aftershock of the deadly Easter Sunday magnitude-7.2 quake that shook Baja California and Southern California, Egill Hauksson, a seismologist at the California Institute of Technology in Pasadena told ABC News. He said the epicenter of Monday's quake occurred in the same zone of the quake in April.
"Aftershocks can go on for months and years," he said.
Thousands of aftershocks have occurred since the Easter earthquake with the largest measuring at magnitude 4.5.
"As soon as it hit, my wife said, 'Grab the baby.' My daughter ran out to the back yard," said Louis Fuentes, chairman of the Imperial County Board of Supervisors, who was in his garage in Calexico, about 30 miles east of the epicenter. "It thumped really hard."
The quake was felt as a gentle rolling motion in the Los Angeles area. There were no immediate reports of significant damage or injury.
The quake followed a series of temblors that struck southern California over the weekend.