(CBS/AP) A suburban Philadelphia landlord secretly videotaped 34 female tenants over two decades after hiding cameras in their apartments, authorities said Friday.

Thomas Daley, 45, will face additional charges stemming from the new victims identified and his alleged efforts to remove some cameras during the investigation, Montgomery County Assistant District Attorney Coley Reynolds said Friday.

Authorities had not previously disclosed the number of tenants involved.

Daley had installed the cameras - typically one in the bedroom and one in the bathroom - in at least 7 apartments he rented to women in Norristown over the last 19 years, Reynolds said.

He hid the tiny cameras behind mirrors and in cabinets and ceiling fans, and some turned on with the flip of a light switch, they said.

CBS Station KYW reports that police were first alerted when a female tenant discovered a camera hidden in her apartment; wires led down to a basement recording system.

Daley's sophisticated set-up enabled him to view the tapes from his home via the Internet, authorities have said.

Daley was arrested Sept. 19 on charges including wiretapping and invasion of privacy.

Detectives have since searched his other apartments and recovered videotapes, records and evidence that led to new charges Friday involving 34 current and former tenants.

Defense lawyer Timothy Woodward did not immediately return a message Friday from The Associated Press.

The charges being added Friday include 34 counts of invasion of privacy, 14 wiretap counts based on 14 audio devices found, and two counts each of burglary and evidence tampering, based on his alleged attempt to break into two apartments and remove cameras after he learned of the probe, Reynolds said.

Daley has been in prison on $1 million cash bail since his arrest, but was being arraigned in court Friday on the new charges. He is expected to waive his right to a preliminary hearing, Reynolds said.

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