Gunman kills four at Tulsa hospital in new US mass shooting: police

Tulsa police cars block an entrance to the hospital where a gunman had earlier killed at least four people

A gunman killed at least four people Wednesday at a hospital building in Tulsa, Oklahoma, police said -- the latest mass shooting to convulse the United States as Texas families bury their dead after a school massacre nearly 10 days earlier.

Ten days later an 18-year-old gunman armed with an AR-15 burst into an elementary school in the small Texas town of Uvalde and killed 21 people -- 19 of them young children -- before being shot dead by law enforcement.