PHOENIX - The 18-year-old suspect authorities claim was plotting to carry out acts of terror in Pima and Maricopa counties, has reached a plea agreement.

Mahin Khan has agreed to plead guilty to three charges: terrorism, conspiracy to commit terrorism and conspiracy to commit misconduct involving weapons.

Khan was arrested back in June after an investigation by the FBI's Joint Terrorism Task Force.

Court documents reveal investigators say they found correspondence from Khan and an unnamed person where he requests weapons, claims he was actively trying to contact members of a terrorist group and also requested a recipe for a pressure cooker bomb.

Two of the charges carry a minimum combined sentence of seven years and a maximum sentence could mean 12 years and three months.

The terms of the terrorism charge dictate Khan will be placed on supervised probation after completing his prison time from the other two charges. The teen would not be allowed to leave the country, must surrender his passport and abide by computer restrictions.

Kahn pleaded not guilty to the charges in July and the man's parents told a Tucson television station their son is autistic and is unable to care for himself or carry out an act of terror.

His sentencing is set for Nov. 4.