HOUSTON -

A man has confessed to sexually abusing a girl, investigators said.

Richard Benjamin, 37, has been charged with two counts of aggravated sexual assault of a child and three counts of possession of child pornography.

Detectives said they got a tip from the National Center for Missing and Exploited Children that Benjamin had posted photographs and chatted with someone about sexually abusing a child. Investigators said Benjamin posted images on Tumblr.

Police said their investigation led them to Benjamin. Officers got a warrant and searched his home, where detectives said they found sexually images of the girl Benjamin claimed to be abusing. Investigators said they also found several pornographic images of children on Benjamin's cellphone.

In addition to confessing to abusing the girl, Benjamin claimed to be grooming her for future abuse, police said.

Officials have not released the girl's age.

Benjamin is being held at the Harris County Jail with bond set at $200,000.