SAN DIEGO (AP) — San Diego County authorities have filed new charges against a suspected vandal they believe scrawled graffiti in the courtroom where he was being prosecuted.

U-T San Diego ( says sheriff’s deputies searched 18-year-old Francisco Canseco’s San Diego home and found evidence linking him to the tagging.

He pleaded not guilty to five felony counts of vandalism this week and remained jailed Thursday.

The city attorney’s office says Canseco was in court in April to face misdemeanor charges of vandalism and possessing tagging tools.

Graffiti was found on courtroom chairs and hallway benches a day after he appeared. Sheriff’s Detective Mark Milton says investigators used a database to match the tags with Canseco’s moniker.

Authorities reached Thursday night didn’t know if Canseco has an attorney who could be reached for comment.