University of Oklahoma has resumed campus operations after a shooting scare.
There was no evidence of shots fired and no injuries after officials with the university reported a possible shooting just before noon central time on Wednesday.
"Shooting on campus. Avoid Gould Hall. Seek immediate shelter in place," the university tweeted.
The shelter in place order was lifted shortly afterward. A university spokesperson told NBC affiliate in Oklahoma KFOR that the school had resumed normal operations, except in Gould Hall, which is home to the university's architecture school.
A message posted on the school's website said, "As of this time, no evidence has been found of any shots being fired. There are no injuries reported at this time. Both the Norman and OU police department have very quickly responded as well as emergency personnel."
University of Oklahoma is in Norman, Okla., about 20 miles outside of Oklahoma City. More than 30,000 students are enrolled there.
The scare came after two campus shootings in the past two days. An unknown gunman wounded a student sitting in the parking lot at Widener University in Chester, Pa., on Monday. Tuesday, a teaching assistant was killed by a fellow electrical engineering undergrad at Purdue University.