Update 11:35 a.m. Friday.
Atchison officials have issued the all clear, saying it's safe to go outside after a chemical cloud enveloped the city this morning.
Atchison City Manager Trey Cocking says at 8:02 a.m. Monday two chemicals were "inadvertently mixed" at the MGP Ingredients plant causing a gaseous plume.
Cocking says HAZMAT protocols were immediately followed. "They put a foam substance on it to treat it, and that's what they've been doing to mitigate it," Cocking says.