EXCLUSIVE: Mother of teen who police say posted Twitter threat against Fairfax HS speaks to FOX 5

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The mother of a high school senior who Fairfax City Police are calling "armed and dangerous" spoke out exclusively to FOX 5.

Kendra Harrison's son, 18-year-old Ishmael O'Brien Lionel Harrison, is accused of making threats on Twitter to harm students at Fairfax High School.

Kendra spoke with FOX 5's Evan Lambert exclusively over the weekend and told him that she does not believe her son is responsible for the threat.

Kendra showed FOX 5 screenshots of the alleged Twitter threat that was profanity laced and which was posted online about a week after the horrific school shooting that left 17 dead at Marjory Stoneman Douglas High School in Parkland, Florida.

Lambert says the profile photo on the tweet appears to show an AR-15 rifle. The tweet in part reads, "I am coming and no one can stop me be prepared." It has since been deleted.

Kendra shared with FOX 5 an arrest warrant that connected her son's phone to the Twitter account from which the alleged threatening tweet came. The warrant also says that authorities have video that allegedly shows Harrison with his phone at the time the alleged threatening tweet was sent. FOX 5's Melanie Alnwick says police say rifle ammunition was recovered from the home and that the teen posted video of himself taking target practice.

The teen is also facing a child pornography charge which Kendra told FOX 5 is related to photos a 17-year-old girlfriend sent to him.

Officials say they consider Harrison "armed and dangerous" and say he has threatened to harm police and has been evading arrest.

"I asked him more than once and he said to me, 'Mom, I'm telling you, I did not do this,'" Kendra told FOX 5's Lambert. She continued to say that she believes the incident is being blown out of proportion and she hopes authorities are fair with her son.

Harrison played lacrosse and football at Fairfax High School and, according to Kendra, planned to attend UCLA on a scholarship. Kendra told FOX 5 that she is working with a lawyer and hopes to have her son turn himself into police sometime Monday evening.

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 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 February 22, and at the time, Harrison did cooperate with detectives.

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