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firefighters discovered foundation problems that made the buildings unsafe to enter, authorities said Saturday.
• Fire crews red-tagged 20 apartment units in a building in the Orange County city of Fullerton after finding a major foundation crack. Structural woes, including broken chimneys and leaning, were uncovered in half a dozen single-family houses, which were also deemed unsafe to occupy until building inspectors clear the structures. The damage displaced 83 residents.
• Despite the evacuations and scattered damage, Friday night's magnitude-5.1 earthquake centered about 25 miles south of downtown Los Angeles mostly frayed nerves.
• The quake was preceded by two smaller foreshocks. More than 100 aftershocks followed, including a magnitude-4.1 that hit Saturday afternoon, the largest in the sequence so far that was felt over a wide region. No injuries were reported.
• Residents were inconvenienced and some lost valuables, but "thankfully the damage wasn't greater," said Chi-Chung Keung, a spokesman for the city of Fullerton.
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• TUCSON, Ariz. (AP) -- Tucson police said Saturday night that they shot pepper spray at several hundred fans who took to the streets and threw beer bottles and firecrackers at officers after the University of Arizona basketball team's overtime loss in the NCAA tournament.
• There were no reports of injuries to fans or officers, but 15 people were arrested for offenses such as resisting arrest, disorderly conduct and unlawful assembly, Tucson police Sgt. Pete Dugan said. Of those arrested, 14 were released, and one was sent to Pima County jail. He said those advancing on officers were arrested. The street was clear and the crowd was gone by late Saturday.
• Dugan said crowds leaving bars and restaurants near campus after the game filled University Boulevard and wouldn't leave despite urging through a PA system and social media declaring it an unlawful assembly.
• Police brought in cruisers and a unit of officers with batons, helmets and face masks to block the street when people started tossing beer bottles, cans and firecrackers, hitting police vehicles and endangering officers.
• Officers fired pepper spray, pepper canisters and pepper balls, which disperse

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