Michigan State Police troopers and other state officials will start a door-to-door sweep of Flint on Tuesday to hand out bottled water and water filters, and the White House says it is monitoring the situation "very closely." The move, announced by the state Sunday, is intended to help address the ongoing water crisis in the city. Flint's drinking water was contaminated with lead, and an unknown number of children were poisoned while the city was under the control of a state-appointed emergency manager in 2014 and 2015. The door-to-door distribution follows an announcement Saturday that water would be available free at fire stations throughout the city. The state said that if no one is at home during door-to-door visits, a flyer with information on how to get free water resources will be left.