Suspect killed after knife attack on campus

Identified as Abdul Artan, 18-year-old refugee and student at university

Incidental occurred at one of America's biggest universities in Columbus

Eleven people hospitalised, one in critical condition

Initial reports claimed 'active shooter' and urged students to 'run, hide, fight'

Witnesses describe how police 'took three shots to take him down'

An attack on Monday at Ohio State University was being investigated as a possible act of terrorism after a student, an 18-year-old Somali refugee, injured eleven people, first with a car and then with a butcher's knife.

The suspect "intentionally" drove drove over a curb, striking multiple pedestrians, before emerging with a knife and stabbing several people.

The suspect was identified as Abdul Razak Ali Artan, a Somali national and legal permanent resident of the US.