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Authorities arrested a Somerville man on Friday for sending obscene materials to a minor.

Somerville Police arrested Isaac Stone Williams. They say the arrest is the result of a year-long investigation. 

In August, Somerville Police say a juvenile went missing from his home. When officers arrived on scene they began canvasing the area and eventually found the juvenile at Williams's home. Later that night, police say the father of the juvenile reported there was allegedly pornographic material sent from Williams to the juvenile's phone.

"I ask that parent monitor the children's social media accounts and any kind of online gaming accounts. There is no way for child to know who they may be talking too," said Aaron Anderson with the Somerville Police Department.