Days after a Plainfield home with lights many believed were flashing "SOS" went viral, police revealed what is actually behind the mysterious display. WATCH HERE WATCH HERE"That has led to a heightened concern that something suspicious is happening on that property," the sheriff's office said. "I was driving past a boarded up house, and I noticed both the front and back porch lights were flashing like a signal. At minimum, the police should require the owner the change the lights off of SOS SOS should always been taken seriously, and only used for emergencies. "The Will County Sheriff’s Office will continue to, as always, follow up on suspicious activity and neighborhood concerns."