A Marymount University student was arrested for his involvement with a bomb threat that forced the campus to evacuate, police said.
Samuel Nwalozie, 18, is charged with communicating threats to bomb a structure.
Police responded to the campus about 8:50 a.m. Sunday to investigate a bomb threat discovered on social media.
After looking at the post and talking to a witness, police say they began to search for the suspect.
Marymount University officials evacuated the campus after the suspect couldn't be found.
"Campus Evacuation! Campus evacuation due to bomb threat. This is not a drill," Marymount's Twitter post read.
Police announced they had taken a suspect into custody around noon.
K-9 units were brought in to sweep the scene and no evidence of a bomb was found. Police say there was no physical threat to students' safety.
The school was on Easter break, meaning fewer students were on campus than usual, a Marymount spokesperson told NBC.
On Sunday afternoon, police announced the campus was re-opened.
Although it was April Fools' Day, Arlington and campus police said that the threat was fully investigated.
Marymount released a statement saying Nwalozie would be disciplined under the school's code of conduct.
He is currently being held in an Arlington County jail without bond, police said.