SAN JUAN, Puerto Rico (AP) — Federal authorities have arrested a 21-year-old Puerto Rico man on charges of producing child pornography.

The U.S. Immigration and Customs Enforcement agency says William Vergara Alamo began sending text messages to a 14-year-old girl who mistakenly called his cellphone one day. Officials say Vergara eventually asked the girl to send sexually explicit photos of herself and then posted them on a fake Facebook account after she said she was no longer going to text him.

Authorities said Friday that Vergara also sent Facebook messages to the girl and some of her father's friends.

It was not immediately clear if Vergara had an attorney.