(CNN) -- A Utah professor allegedly caught looking at child pornography during an airline flight said Monday at a court hearing that he is innocent, the Suffolk County, Massachusetts, district attorney's office said. A passenger aboard Grant D. Smith's Salt Lake City-to-Boston flight on Saturday spotted him looking at what appeared to be images of young girls, nude or performing sex acts, and alerted the flight crew and a family member, who in turn notified law enforcement, according to a statement from the district attorney's office. When a flight attendant asked Smith to shut down his computer, he began deleting images, prosecutor Erik Bennett said, CNN affiliate WCVB reported. Police who met the plane were able to recover 66 images from the computer, said the station, citing authorities.
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NEW: Massachusetts judge sets bail at $75,000
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NEW: Authorities seize Grant Smith's laptop and cell phone as evidence
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The Utah professor is to return to court on December 27
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He is accused of looking at child porn on a cross-country airline flight
"The @placeholder, however, has no tolerance for viewing or possessing of child pornography by any of its employees, regardless of where it occurs."