Five people, including the shooter, have reportedly died in mass shooting at a medical facility in Tulsa, Oklahoma.
According to a police report, on Wednesday, a man armed with a rifle and handgun killed four people inside St Francis Hospital campus before turning the gun on himself.
However, they are exploring the possibility of a bomb on the site of the shooting.
“We are the scene at 3325 Park Place North in reference to a possible bomb inside,” Muskogee police department spokesperson Lynn Hamlin said to the Independent.
“At this time we have evacuated the house and have notified everyone in the area to stay inside their homes.”
In a statement on Twitter, Oklahoma Governor Kevin Stitt condemned the killings as “senseless act of violence and hatred.”
“I have offered Mayor GT Bynum any state resources that may be needed, and I ask all Oklahomans to come together in support of the Saint Francis health system community,” Mr Stitt said.
The shooting came a day after gunshots erupted at a New Orleans high school graduation and a week after a shooter attacked a primary school killing 19 children and two teachers.