A student went on a building-to-building stabbing attack at a Texas community college Tuesday, wounding at least 14 people before being subdued and arrested, authorities said.

The attack at about 11:20 a.m. on the Lone Star Community College System campus sent at least 12 people to area hospitals, including four people taken by helicopter, according to volunteer fire department spokesman Robert Rasa. He said several people refused treatment at the scene and all the wounds were consistent with stabbing.

Sheriff Adrian Garcia said officers responded to the campus after receiving a call about a male “on the loose” stabbing people. He said it was not immediately clear what type of weapon was used.

“Some of the details in the call slip did indicate that students or faculty were actively responding to work to subdue this individual,” Garcia said, describing the man as being about 21 years old and enrolled at the college. “So we’re proud of those folks, but we’re glad no one else is injured any more severely than they are.”

Lone Star officials initially urged people on campus, about 25 miles (40 kilometers) northwest of downtown Houston, to take shelter and be on alert for a second suspect. But the sheriff’s department said a short time later that authorities believed just one person was responsible.

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