Missouri Department of Conservation

The suspected gunman was found dead in the school from a "self-inflicted injury," Canadian police said.

With the search for Nancy Guthrie in its tenth day, law enforcement sources told CBS News that the Pima County Sheriff's Office detained a person for questioning. Tony Dokoupil anchors this special report.

Nancy Guthrie, the mother of "Today" show cohost Savannah Guthrie, has been missing for 10 days.

Savannah's Guthrie's mom, Nancy Guthrie, was reported missing Feb. 1, and authorities have still not identified a possible suspect.

A federal grand jury refused to indict six Democrats who drew President Trump's ire by taping a video telling members of the military that they must reject "illegal orders," three sources told CBS News.