HOUSTON — A Houston man who traveled to Maine and took sexually explicit images of a 14-year-old girl he met online must serve 25 years in federal prison.

Daniel M. Layne was sentenced Thursday in Houston. The 34-year-old Texan in February pleaded guilty to production of child pornography.

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Prosecutors say Layne used the Internet to communicate with underage girls and discuss having sex with them.

The investigation began last year in Maine when a mother discovered a motel key card in her daughter’s pants pocket and sexually graphic messages on her cellphone.

Layne’s home was searched last September. Authorities seized computers, a table and cellphones with images of the girl. Layne was arrested in October.

Further details on the girl weren’t released.