A patient has allegedly opened fire in the psychiatric ward of a Philadelphia-area hospital, killing his case worker and wounding his doctor, who returned fire.
The patient, Richard Plotts, was seriously injured in the gunfight with his psychiatrist, Dr Lee Silverman. Plotts remains in a critical condition.
Dr Silverman suffered a grazed temple during the shooting on Thursday afternoon at Mercy Fitzgerald Hospital in Darby, just southwest of Philadelphia.
The motive remains unclear.
Delaware District Attorney Jack Whelan said Plotts, 49, might have had issues with the doctor over his treatment plan, but it is not known whether that is why Dr Silverman was armed, apparently against hospital policy.
It appeared that the doctor acted in self-defence, according to Mr Whelan.
Read more on Sky News.