RIVERSIDE, Calif. Authorities say they seized 40,000 marijuana plants at an illegal pot farm east of Los Angeles. The Riverside Police Department says a tip regarding the strong odor of marijuana coming from a home sent them to a house that turned out to have a private nursery about the size of a city block. Detectives armed with a search warrant entered the property on Thursday. Authorities say they found enough plants to make about 10 tons of pot with an estimated street value of $20 million.