Four people, including three children, were found dead in an Oklahoma home Thursday evening following an hours-long standoff with an armed subject. The incident began when a police officer saw fireworks coming from the garage of the house and found a woman and two children locked inside. The woman told the officer that another woman with a gun held her hostage in the garage, prompting the standoff. The identities of the deceased have not been released, but authorities believe the incident may have been a murder-suicide. The investigation is ongoing.