Texas Christian University was placed on lockdown after a reported shooting on campus in Fort Worth, Texas.
Fort Worth police said the incident stemmed from an argument between the two shuttle bus employees. That driver slammed their van into the other transport.
In a tweet sent out around 7:10 a.m., TCU told those nearby to "seek safe shelter immediately".
The alert was lifted later in the morning after police were able to locate a suspect. One employee shot at the other employee.
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Aerial footage shows police cars on a road near the university's football stadium, with a white shuttle parked nearby.
The suspect has not been identified, but authorities say he is a black male wearing a white shirt and black trousers.
At 8 a.m., TCU said the lockdown remains as they search for the shuttle driver.