(CNN) Houston Police Chief Art Acevedo has spent the past few months demanding action after a series of mass shootings. In a Facebook post Friday night, hours after a teenager allegedly shot and killed 10 people at Santa Fe High School , Acevedo shared his frustrations. Retired Houston Officer John Barnes was injured in Friday's shooting. "Today I spent the day dealing with another mass shooting of children and a responding police officer who is clinging to life. John Barnes, a retired Houston police officer who was working as a school resource officer at Santa Fe High, was wounded in the massacre, a hospital official said.

Source: CNN May 19, 2018 09:33 UTC