An alert of a possible shooter at Claremont McKenna College on Thursday evening that prompted shelter-in-place orders and a multi-agency law enforcement response turned out to be a false report, Claremont police said.

Someone called police around 4:45 p.m. claiming to be holding someone captive in a Claremont McKenna bathroom with a bomb, with the caller also threatening to walk around campus with a rifle and shoot anyone seen.

The campus community received a series of alerts as officials from the Claremont, La Verne, Ontario and Upland police departments arrived.An initial alert that came through at 4:56 p.m. warned the community of police activity on campus. A 5:11 p.m. email said there was a possible shooter.

“POTENTIAL SHOOTER ON CMC CAMPUS STAY AWAY FROM THE AREA GHEAVY (sic) POLICE PRESENCE IN THE AREA,” the email read.

Recipients were urged to avoid all places where law enforcement was present and to call 911 or campus police if they saw suspicious activity.

About a dozen police and SWAT vehicles were around Columbia and Eighth Street, with two helicopters circling overhead.

After searches of the Claremont McKenna campus as well as buildings on neighboring Claremont Colleges campuses, law enforcement didn’t find any victim or anyone with a weapon. Police determined the situation to be a swatting call, a false report to law enforcement meant to provoke a large response.

As of Friday, there had been no arrest with the police investigation continuing.

Ryan Shakiba, a Claremont McKenna student, was walking on campus when Campus Safety told everyone to leave.

“We were told about an hour ago by campus security to run and to get off campus,” Shakiba said. “I don’t know much more beyond that, but I can’t return to my dorm as of now.

“It’s crazy,” he added, “this is happening the last day before spring break.”

Police ask anyone with information about the Claremont false report to contact the department at 909-399-5411.

The day before, on Wednesday, authorities believe another swatting call played out, that one at the children’s section of the Loma Linda University Medical Center. It meant evacuations and 100-plus officers from across the region responding. A suspect had not been identified, a San Bernardino Sheriff’s Department official said on Friday.

There is no known connection between the two swatting events, Claremont Police Chief Mike Ciszek said.