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Logan police on Wednesday said they had arrested a 68-year-old prison parolee for allegedly sending "adult oriented material" to a high school student.

The arrest came a day after the department released video of a suspect in the lobby of a Logan post office and requested the public's help in identifying the man.

Police said Thomas Mark Thackeray has been involved in active stalking behavior for several months.

Thackeray was paroled from the Utah State Prison in April 2014, after serving time on similar charges, police said.

He was jailed Wednesday on suspicion of third-degree felony stalking charge, and well as for violating his parole.

Detectives found evidence of other potential victims and other potential criminal violations, police said, adding that the investigation was ongoing with additional charges possible.

Thackeray allegedly mailed five packages of adult material and sexually explicit letters to the Logan High student, according to police.

Logan police Lt. Rod Peterson said the first package was sent March 10 and the most recent went out May 21.

Peterson said the packages include "sexually explicit devices," but declined give further details. The letters, he said, included instructions on how to use the devices and say "sexually explicit, perverted things."

Utah court records show that in 2008, Thackeray, then living in Riverdale, pleaded guilty to four second-degree felony counts of dealing in harmful material to a minor and one third-degree felony count of stalking. He was sentenced to prison for up to 30 years.

In 1992, he pleaded guilty to one count of third-degree felony dealing in harmful material to a minor. Initially sentenced to probation, he ended up being committed to prison in 1994.