Two men and two women have been detained following a barricade situation in midtown.
Officer Dan Lucas, spokesperson with the Tucson Police Department, says officers were called to a home in the 300 block of South Calle de Mardrid regarding an aggravated assault call.
When officers arrived on scene they detained a man and woman who told police there was another couple inside the home who may be armed.
SWAT was called to the scene and were able to get the man and woman to exit the home, said Lucas.
Police are still at the scene investigating.