Do you live next to a foreclosed home? You could be living next door to a death trap! An estimated 4 million Americans now live next door to a home that's in foreclosure. According to NBC News, these abandoned houses are becoming a problem for nearby neighbors, because living next door to an abandoned home can be dangerous. How? Abandoned homes can attract squatters - or people who break into empty homes or buildings illegally for the purpose of living there rent-free. Squatters can be drug dealers, con artists, sex offenders, and felons. Also, with no one to maintain a foreclosed home, it's easy for vandals to come along and break the doors or windows. Once this happens, animals can move in - along with mold and rot. If the abandoned home has a swimming pool, the water can turn into a perfect breeding ground for mosquitoes - which can carry the West Nile virus. The swimming pools can also become death traps for curious children. A 5-year-old girl mentioned in the article died after falling into the pool of an abandoned home.So who's responsible for making sure these abandoned homes don't become a danger to nearby neighbors? It's a difficult question to answer, because it can be tough to figure out who's legally responsible for the home. The owners don't live there anymore, and according to Alan Thorup of the Indiana Mortgage Bankers Association, banks could actually be sued for attempting to improve the properties they take over. Some cities are tired of the problem. So they're starting to take action. For example, a city in California passed a local law that requires banks to maintain the properties they've foreclosed upon. A town in Florida makes banks pay a fee to register foreclosed properties, and this money is used to keep the properties in good shape.If you're concerned about an abandoned home in your neighborhood, contact your city's offices to see who you should talk to. If you think a squatter might be living in an abandoned home, call the police.