What we know about the shooting at a Tulsa medical center

Amna Nawaz:

Yesterday afternoon, Tulsa, Oklahoma became the site of the 233rd mass shooting in the U.S. so far this year. This time, the target was a medical building on the campus of St. Francis Hospital.

Today, authorities identified the gunman as 45-year-old Michael Louis of Muskogee, saying he was armed with an AR-15-style rifle and a semiautomatic handgun. Louis shot and killed two doctors, a receptionist, and a patient, before shooting himself.

Authorities said the gunman legally purchased the rifle about two hours before the shooting and targeted Dr. Preston Phillips, who had recently performed back surgery on Louis.

Wendell Franklin is Tulsa's police chief.

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