SHEFFIELD — Helen Keller Hospital remained on lockdown today after hospital officials were notified of a possible threat against a patient.

Julia Boughner, a hospital spokeswoman, said the facility has been under lockdown since 9 p.m. Sunday.

“We have security officers posted at every entrance and employees have to show identification badges to enter the hospital,” Boughner said.

She said visitors must enter through the emergency room.

“Visitors must tell the security guard what their business is and if they are visiting, who they are coming to visit and the room the patient is in,” Boughner said.

She said local law enforcement was immediately notified Sunday of the possible threat.

“And they are doing everything possible to make sure patients and employees are safe,” Boughner said.

She said so far there has been no indication of any problem.

“It was just a reported threat,” she said.

Boughner said the facility has a plan for situations of this kind and has been following protocol since hospital officials were notified of the possible threat Sunday night.

“No one has been injured and there has been no indication of any problem,” Boughner said. “But we will keep the security measures in place as long as the patient is in our hospital and we will stay in lockdown.”