No evidence of shooting at OU, Boren says

12:20 p.m. OU President David Boren said Gould Hall has been searched by police officers and SWAT team members and they've found no evidence that any shots were fired. Regular campus operations are being resumed, with the exception of Gould Hall, where authorities continue to search.

Boren said he's not sure the origin of the noises that students reported.

12:10 p.m. OU police have issued an alert asking students to continue to avoid Gould Hall, but otherwise to resume normal activities on campus.

12:05 p.m. Joey Stipek, an OU journalism student, said armed authorities entered Gould Hall about 11:45 a.m.