Swiss police are investigating whether a deadly bus fire in Kerzers was set on purpose. Police say the bus caught fire on Tuesday evening. At least six people died and five others were injured. A police spokesperson says a “voluntary act” may have caused the blaze. Another police official says reports claimed someone poured flammable liquid on themselves. Officials say they are still verifying that claim. Police say they see no sign of terrorism. Rescue teams found the bus fully engulfed by flames. Crews flew three badly hurt people to hospitals by helicopter. Authorities say victim identification may take days.