Houston hostage situation

Police are shown working at the scene of an emergency at Tomball Regional Medical Center in Tomball, Texas. The Harris County Sheriff’s Office said Saturday night it believed the man was a distraught parent of a patient and at least two people were being held hostage.   (Melissa Phillip / AP)

Tomball Police Det. Jimmy Harral speaks to the media at Tomball Regional Medical Center in Tomball, Texas. The Harris County Sheriff’s Office said Saturday night it believed the man was a distraught parent of a patient and at least two people were being held hostage.   (Melissa Phillip / AP)

Police are shown working at the scene of an emergency at Tomball Regional Medical Center in Tomball, Texas. The Harris County Sheriff’s Office said Saturday night it believed the man was a distraught parent of a patient and at least two people were being held hostage.   (Melissa Phillip / AP)