Monday saw yet another lone attacker cause devastation at a US University.
Eleven people were rushed to hospital with one in a critical condition after an attack by an Ohio State student on the Columbus campus on Monday.
 
Investigators say the attacker was 18 year old Abdul Razak Ali Artan, who deliberately drove his car onto a pathway and began attacking students with a knife at the University. Ohio State Police Officer Alan Horujko shot dead Artan after he failed to obey orders to stop.
 
FBI investigators are now looking at the suspect's Facebook page to determine whether this act of violence was terrorism related, although they say it will take time to confirm the cause of the man’s actions.
 
At first, it was believed that the suspect was an active shooter on campus although it is now confirmed the man carried a butcher’s knife.
 
The University’s emergency management agency tweeted within minutes of the attack: ‘’ Buckeye Alert: Active Shooter on campus. Run Hide Fight. Watts Hall. 19th and College" prompting 'widespread fear and panic across the campus.’
 
Eye witnesses told how it 'took three shots to take him down', with his rampage lasting less than two minutes thanks to campus officer Alan Horujko.
 
"We owe him a debt of gratitude," said Monica Moll, director of Ohio State public safety. "He did a fabulous job today."
 
There has been an increase in the number of lone attackers in the US over the past year.
 
In January, a lone wolf attacker shot a police officer in a marked police car. The officer was shot in the left arm several times but was able to get out of the car to shoot the attacker. In hospital, the attacker Edward Archer pledged his allegiance to IS.
 
In September, three officers were left injured after a shootout with suspect Ahmad Khan Rahami, who had left pipe and pressure cooker bombs in New Jersey and Manhattan injuring 29 people.
 
In April 2013, we saw one of the most prolific lone attacks occur in Boston when two brothers, Tamerlan Tsarnaev and Dzhokhar Tsarnaev, set off explosives near the finish line of the Boston marathon killing three and injuring 264 people.