Fairfax man considered 'armed and dangerous,' suspected of high school threat, evading arrest

Fairfax City and County police are looking for an 18-year-old Fairfax man, who they say should be considered "armed and dangerous," after they say he made a threat on social media directed at Fairfax High School and has been evading arrest.

Police say 18-year-old Ishmael O'Brien Lionel Harrison is suspected for threats to commit serious bodily harm to people on school property, and for child pornography.

Investigators say they identified Harrison after a threat was directed at Fairfax High School made on Twitter. Police say they spoke with several suspects at the time the threat was made on Feb. 22, and at the time, Harrison did cooperate with detectives.

Police say after the threat, they increased security at Fairfax High as well as area schools, and are continuing to do so.

Investigators say they received information that led officers to suspect Harrison further and had probable cause for search-and-arrest warrants for him. Following a search of the home, investigators say they found rifle ammunition at the suspect's home on March 2.

Following the search, officials say they consider Harrison "armed and dangerous," taking also into account information that he has also threatened to harm police and has been evading arrest.

Detectives say both Fairfax County and City of Fairfax officers attempted to serve warrants for Harrison's arrest, but have not been able to locate him.

Police now saw they are appealing to Harrison and those who know where he is, to turn himself him.

Police say Harrison is about five feet, seven inches tall, weighs 170 pounds and has brown eyes and black hair. He has been known to drive a black two-door Acura, with Virginia plate number VYZ-8467.

Investigators say they are working federal, state and local law officials to get Harrison into custody.

They say that Fairfax High School has been a "strong partner" in their investigation.

Anyone with information that could aid detectives in their investigation is urged to call (703) 385-7924.