WARWICK SCHOOL•TWITTER Mohammad stabbed four people during his rampage

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Computer science student Faisal Mohammad was shot dead by officers last week after the horror incident at the University of California Merced. The 18-year-old "smiled" as he stabbed two students, a campus construction worker and female teacher using a 10-inch blade. His terrifying attack was later praised by an ISIS-linked Twitter account.

Mohammad was found carrying highly flammable petroleum jelly - dubbed "poor man's C4" by police - along with ziptie handcuffs, night vision goggles, duct tape and a hammer in his rucksack. Now investigators have found a printout of the Islamic State flag among the attacker's possessions - but officers were quick to dismiss claims the brutal assault was related to the evil terror group. County Sheriff Vern Warnke said a two-page note found inside Mohammad's pocket suggested the attack was based on "personal animosities" - motivated by revenge for being booted out of a study group. Warne said "there is nothing to indicate this was anything other than a teenage boy who got upset with fellow classmates".

Mohammad, described as anti-social by his university roommate, was reportedly "having fun" as he slashed his first victim in the throat inside a classroom. Then construction worker Byron Price was stabbed by the student as he tried to intervene and stop the attack.

WARWICK SCHOOL Mohammad was described as anti-social by his former roommate

He had a smile on his face, he was having fun Bron Price

The 31-year-old said: "He had a smile on his face, he was having fun - which is more what bothers me." Mr Price - who drove himself to hospital where he received nine staples - has been credited by police with saving the first victim's life. He said: "I just kind of kicked at him. It was a really big knife and he was swinging it down so I figured if I was on the ground and my feet were at him, he could get my legs and not my body."

FACEBOOK Victim Byron Price had to have nine sables after the attack