HOUSTON -

Four men, including one from Spring, are facing charges in an international child pornography ring.

The investigation began in Harris County with a Cybertip to Harris County Constable Precinct Four's Office.

Investigators said a woman called them and said she'd been chatting online with a man named Jeffery Thomas Clark.

She said at one point Clark asked if she had a daughter and said he was attracted to young girls. The woman said Clark wanted to perform sexual acts with her daughter.

That's when she called deputies.

After an investigation, deputies found Clark in a home in Spring and he was arrested and charged with Attempted Aggravated Sexual Assault of a Child under age 14.

Clark's computer and media were analyzed and investigators said they found child pornography.

Harris County Constable Precinct Four contacted their counterparts with other Internet Crimes Against Children Task Forces and the National Center for Missing and Exploited Children in an effort to identify and arrest the offenders for violations of child pornography, and rescue any child victims.

From April of 2010 through April of 2013, investigators with the National Center for Missing and Exploited Children, Federal Bureau of Investigation, the United Kingdom's Child Exploitation and Online Protection Center and West Yorkshire Police Department, the United States Air Force Office of Special Investigations, and several other state, local, and federal agencies worked the case.

Ultimately, three people were identified, arrested, charged, and found guilty of possession and promotion of child pornography. Those men are: John Hardcastle, 52, of, Leeds, United Kingdom; Patrick Daniel Quinsland, 26, of Ohio; and; Freddie Sizemore, 38, a civilian employee at the Ronald Reagan Missile Defense Test Site in Kwajalein Atoll, South Pacific.