In this Dec. 23, 2007, file photo, the beaches adjacent to the Tijuana Estuary are posted with signs declaring them unsafe due to pollution that flows through the estuary after feeding in from Tijuana, Mexico in Imperial Beach, Calif. Officials in California are crying foul after more than 140 million gallons of raw sewage spilled into the Tijuana River in Mexico and flowed into the U.S. for more than two weeks.