“Deplorable,” “disturbing” and “confusing” was how Mayor Joseph Curtatone and Superintendent of Schools Tony Pierantozzi described the allegations against 27-year-old Somerville resident and former Somerville elementary school teacher Josh Wairi, who was arrested on child pornography charges at his Beacon Street apartment April 17.

Wairi, a fifth-grade teacher in Cambridge at the time of his arrest, allegedly admitted to police that in addition to possessing and sharing child pornography with others online, he had secretly videotaped children in a locker room changing in and out of clothes with his cellphone camera. Where that videotaping took place is not clear.

He is being held without bail pending a detention and probable cause hearing in federal court in Boston Wednesday, April 27. According to police, authorities were made aware of Wairi’s alleged activities through an online tip.