[img]http://d.yimg.com/a/p/ap/20100404/capt.e57acc36263e4c918026d5437347e996-e57acc36263e4c918026d5437347e996-0.jpg?x=130&y=86&q=85&sig=SM1poyqHTFFdrbyiUPyH9w--[/img]AP - A strong earthquake south of the U.S.-Mexico border Sunday swayed high-rises in downtown Los Angeles and San Diego and was felt across Southern California and Arizona, knocking out power and breaking pipes in some areas but causing no major damage.