Grant Smith, 47, of Cottonwood Heights, Utah, was arrested Saturday after Massachusetts State Police reviewed his computer with his permission shortly after he disembarked from the flight around 4 p.m., police said.

Smith was sitting in first class when the fellow passenger saw the images on his computer and became concerned. The other passenger alerted a flight attendant and also sent an email to a relative, who called law enforcement, according to a release from state police.

Smith was met at the gate at Logan International Airport by state troopers who requested and were granted permission to check his computer. He was charged with possession of child pornography and was scheduled to be arraigned in East Boston District Court.

"Child pornography is a form of child sexual abuse — nothing less," state police spokesman David Procopio said in a statement. "Those who possess it — a crime unto itself — foster an evil network that sexually abuses and exploits children irreparably."

Smith was held over the weekend by state police on $15,000 bail. It was not immediately clear if he had a lawyer.