The man is reportedly terminally ill and is threatening to shoot himself. A dog, also believed to be terminally ill, was in the home with the man, a source said.
Police News Affairs Officer JoAnn Taylor said the dog has been released from the home and taken to an animal hospital in "stable" condition. She said the dog was not injured in the incident and was most likely ill prior to the barricade incident.
Police said the elderly man was armed.
Students attending Saturday classes at Schurz High School were evacuated from the building due to the school's proximity to the incident, police said.
Police from the Hostage Barricade Terrorism unit remained at the scene at 1 p.m.