multiple charges for failing to protect citizens. all four suspects face penalties up to 20 years in prison. and some of the charges in 2014, officials switched the city's water supply from a system which pull from the core rosive minute river. that move triggered widespread lead poisoning. >> they've been treating this almost like a mafia investigation. moving higher and higher up the chain. two of those people report directly to the governor so they're moving right up the chain here. >> it was ordered from such a high level. and putting so many people in danger. to china now issuing a red alert as beijing enters its fifth straight day of dangerous smog levels. officials sate smog has grounded 181 flights. most highways are closed. hospitals are gearing for a surge in patients since the smog is known to cause breathing problems. you know, occasionally, we'll