NEW YORK ( CNN ) -- A man accused of entering New York 's LaGuardia Airport with a bag containing wires and batteries has been indicted on terror-related charges . Scott McGann , 32 , faces an August 18 arraignment after he undergoes a court-ordered psychiatric evaluation . Scott McGann , 32 , was indicted Wednesday on charges of placing a false bomb or hazardous substance in the first degree ; placing a false bomb or hazardous substance in a transportation facility ; and making terrorist threats , according to Queens District Attorney Richard Brown . If convicted , McGann faces up to seven years in prison , Brown 's office said Friday . McGann initially appeared in court Saturday , but his arraignment was postponed until August 18 pending a court-ordered psychiatric evaluation , Brown 's office said . McGann is being held at the Bellevue Hospital prison ward , according to the New York City Department of Correction . Authorities said McGann walked into LaGuardia 's central terminal on Saturday morning with what was determined to be a fake bomb . The terminal was shut down , then evacuated , but it reopened after several hours . `` The defendant is clearly a very troubled young man , '' Brown said . `` As a result , the court has directed that he be examined to determine whether he has the capacity to understand the proceedings against him and assist in his defense . '' McGann allegedly arrived at a checkpoint in the terminal at about 4:50 a.m . ET Saturday , carrying a backpack and refusing to answer security questions . Authorities said the officer at the checkpoint was informed that a suspicious package was attached to the bottom of McGann 's backpack and that McGann allegedly grabbed what appeared to be a trigger device with a red button connected to the backpack . McGann allegedly pressed the button several times before an officer with the Port Authority of New York and New Jersey grabbed the trigger and the package away from him . The package turned out to be a device consisting of batteries , cylinders and electronic components that could have been used to make a bomb , Brown said , but the bomb squad found that it did n't not contain any explosives . McGann had a ticket on a United Airlines flight to Chicago , Illinois , and a seat on two other connecting flights with his final destination , Oakland , California , according to a law enforcement official close to the investigation . McGann has three earlier arrests in the New York area , the source said . The most recent involved charges in June of tampering with evidence and resisting arrest . He also was arrested twice in 2008 , the source said . Port Authority spokesman John Kelly said McGann was `` just acting crazy . '' The arresting officers described McGann as `` extremely disheveled and dirty '' and in a `` near catatonic state '' and `` staring off into space , '' Kelly said . McGann had been homeless for at least a year . Authorities evacuated the terminal after 5:20 a.m. but allowed passengers back in to all areas except Concourse C by midmorning , Kelly said . The concourse was reopened shortly before 11 a.m. Saturday , according to Federal Aviation Administration spokeswoman Holly Baker . Authorities had stopped flights from taking off or landing at the airport , but flights resumed shortly after 9 a.m. , Baker said . The incident disrupted travel plans for many passengers and caused American Airlines to cancel 16 flights , said an airline representative . American Eagle , Continental Airlines and Southwest also reported delays . CNN 's Chuck Johnston , Aspen Steib , Ross Levitt , Laurie Segall , Kristen Hamill and Susan Candiotti contributed to this report .
Scott McGann carried fake bomb into LaGuardia Airport terminal , authorities say . McGann , 32 , indicted on terror-related charges , prosecutor says . Suspect undergoing court-ordered psychiatric evaluation . Comment: