3:35 p.m. Police said they have taken the woman into custody. She had threatened to harm herself. The woman's name was not released.
The highway was reopened.
2:30 p.m. Newcastle police, McClain County deputies and Oklahoma Highway Patrol troopers have blocked State Highway 9 both directions east of Pennsylvania Avenue after a woman with a gun was reported on the north service road near an antique store.
Check back with NewsOK for updates.