LANSING, MI -- Gov. Rick Snyder has not been questioned as part of Attorney General Bill Schuette's criminal investigation into the Flint water crisis, he said Wednesday.

"With respect to this investigation I have not been questioned or been interviewed at this point in time," Snyder said.

The Flint water crisis emerged when the city switched water sources under an emergency manager in 2014. More corrosive water leached lead into the city's water supply, exposing an unknown number of children to the toxin.

Schuette started an investigation in January and announced charges against one city and two state employees earlier Wednesday. He would not say at a press conference Wednesday whether he or investigators had questioned the governor, but also didn't write him off as somebody to question as the investigation progresses.

"There are no targets, but we rule nobody out," Schuette said in response to a question about Snyder.

Asked Wednesday if he felt he did anything criminally wrong, Snyder said he didn't want to get into speculation but added, "I don't believe so."

He noted that he had been cooperating with investigations from both the Attorney General and federal government.

Schuette's investigation charged one local employee, Michael Glasgow, along with Michigan Department of Environmental Quality employees Stephen Busch and Michael Prysby. Glasgow was charged with tampering with evidence and willful neglect of office. Prysby and Busch are charged with misconduct in office, conspiracy to tamper with evidence, tampering with evidence, and the violation of two drinking water laws.

Snyder released a statement regarding the criminal charges, saying he was deeply troubled by the news.

"This is deeply troubling. I have said all along that bureaucrats making bad decisions failed the people of Flint. The charges filed today raise what happened to a whole new level and we take that very seriously," Snyder said.

The two DEQ employees have been suspended without pay.

Emily Lawler is a Capitol reporter on MLive's statewide Impact Team. You can reach her at elawler@mlive.com, subscribe to her on Facebook or follow her on Twitter: @emilyjanelawler.