FOG BLOG TRAGEDY LOG: SHOOTINGS AT TULSA MEDICAL CENTRE , LATEST IN A LINE OF MASS SHOOTINGS LATELY!

Gunman who killed 4 at Oklahoma medical building had been a patient of a victim, police chief says The gunman who killed two doctors and two others at an Oklahoma medical building Wednesday did so after he blamed one of the physicians for causing him pain from a recent back surgery, a police chief said Thursday.

The shooter, Michael Louis, who police said killed himself after the rampage in Tulsa, had just earlier that afternoon legally purchased one of the firearms used in the slaughter, an AR-15 style rifle, city Police Chief Wendell Franklin said during a news conference.

Louis entered a physicians' office building at Tulsa's Saint Francis Hospital campus late Wednesday afternoon and shot dead his surgeon, Dr. Preston Phillips, and three other people before fatally shooting himself, said Franklin.

The other three victims at the Natalie Medical Building were Dr. Stephanie Husen, receptionist Amanda Glenn and patient William Love, authorities said. Officers found a letter on Louis that "made it clear that he came in with the intent to kill Dr. Phillips and anyone who got in his way," Franklin said.

"He blamed Dr. Phillips for the ongoing pain following the surgery," Franklin said, later calling the letter's contents "a clear motive." The others, Franklin said, just "stood in the way, and Louis gunned them down." An unspecified number of other people were injured in the shooting, which happened in orthopedic offices of the Warren Clinic on the building's second floor, officials said at Thursday's news conference. These were the victims of the Tulsa shooting Officials declined to say whether the injuries to those people were caused by gunshots or attempts to flee the violence; authorities had earlier said that fewer than 10 people had non-life-threatening injuries. The Warren Clinic is a series of primary and specialty care offices within the Saint Francis system. The mass shooting is among the latest instances nationwide of first responders and civilians coming face-to-face with the threat of gun violence in public places. It comes more than two weeks after a racist assault at a supermarket in Buffalo, New York, and a bloody attack at a church in California; and eight days after a heartbreaking massacre at an elementary school in Uvalde, Texas.