ST. LOUIS — A Roman Catholic priest already accused of trying to pay for sex with a 16-year-old girl was indicted Thursday on new charges, including one involving child pornography.

The Rev. James P. Grady, 58, already faced a felony charge of attempting to obtain a minor for a commercial sex act.

The superseding indictment adds a claim that Grady possessed three pornographic images of young girls on a laptop computer. Prosecutors also added a felony charge of using interstate commerce to attempt to entice or coerce someone under 18 to engage in prostitution or sexual activity.

The laptop was searched after he was arrested in the summer at a sting run by the FBI and police from St. Louis County and Maryland Heights.

Prosecutors said Grady, then pastor of St. Raphael the Archangel Church in south St. Louis, responded to an online ad that offered two girls and used "hussyfan" and two other code words taken from child pornography that are often used to describe underage girls.

Grady allegedly exchanged e-mails with an undercover officer, then showed up July 29 at a house in St. Louis County and agreed to pay $80 for 30 minutes with the girl, asking for "kissing" and oral sex.

In testimony at a hearing last month, FBI Special Agent Cynthia Dockery said Grady allowed investigators to search his car, cell phone and laptop computer and told them that he responded to the ad because he was "curious."

In addition to the new criminal charges, prosecutors added a forfeiture count that could result in Grady losing his 2007 Toyota Camry, the car he used to drive to the site of his arrest.

His trial is scheduled for Jan. 19. The sex charges each carry a penalty of 10 years to life in prison; the child porn possession charge carries a maximum of 10 years.

St. Louis Archbishop Robert J. Carlson has suspended Grady pending the outcome of the case. A representative of the archdiocese declined to comment Thursday night, citing a policy of not commenting on pending cases.

Grady's lawyer did not return a call and an e-mail seeking comment.