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A woman strapped to a gurney on her way to a mental health checkup at a Texas hospital was able to take out a stashed gun and open fire inside an emergency room, police said.

The suspect, identified as 65-year-old Glendar Johnson-Jackson, was brought to HCA Healthcare Conroe on Tuesday for a mental health evaluation after allegedly causing a disturbance at a local business, news station ABC 13 reported.

She was strapped to a stretcher in the hallway, with her arms and legs secured, when police said she somehow got hold of a small-caliber gun from a waistband-style holster concealed under her dress.

Police said Jackson-Johnson squeezed off two rounds before an EMS worker wrestled the gun out of her hands.

Conroe Police Chief Jeff Christy commended the paramedic’s “heroic” actions, which he said “likely saved innocent lives.”

Johnson-Jackson now faces charges of felony deadly conduct and a misdemeanor count of unlawful carry of a weapon in a prohibited place, according to Montgomery County jail records.

She was medically cleared to be booked into the county jail, where she remained Wednesday.

The hospital later released a statement addressing the shooting incident.

“HCA Houston Healthcare Conroe is aware of an incident that occurred in our emergency department earlier today,” it read in part. “There were no injuries sustained. We are committed to high-quality care and maintaining patient and colleague safety.”

The Harris County Sheriff’s Office has launched an internal investigation to determine how Jackson-Johnson was allowed to be brought into the hospital with a gun hidden on her person after being detained by deputies.