An Arizona man was arrested Friday and accused of conspiring to commit terror attacks in Phoenix and Tucson, federal and state officials said.

Mahin Khan, 18, of Tucson, appeared before a Phoenix judge Saturday morning, according to the state attorney general’s office. He faces two counts of of conspiracy to commit terrorism and terrorism.

Khan was ordered held without bond in the Maricopa County jail.

Arizona Attorney General spokeswoman Mia Garcia told reporters Khan was accused of conspiring to carry out attacks on government buildings.

Garcia said that Khan’s court records are under temporary seal, but did say that authorities do not believe Khan made any threats involving the July 4 holiday weekend.

A message left at a phone number listed for Khan was not immediately returned and it was not immediately clear whether he had an attorney. 

The Associated Press contributed to this report.