A former teacher has been charged with molesting four students he taught at a McLean school more than 40 years ago after one of the alleged victims — now in her mid-50s — came forward.

Christopher R. Kloman, 73, of McLean was arrested Friday after a year-long investigation into reports of abuse at the Potomac School in 1968 and 1969, Fairfax County police said.

Authorities were tipped off by an alleged victim in November 2011 after she ran into Kloman at the Washington Episcopal School and saw that he was teaching children, police said.

The woman told police she had been molested by Kloman when she was 12. Kloman had been her teacher at the Potomac School, where he held teaching and administrative positions from 1965 to 1994, police said.

Later, he taught at schools in Maryland and served as a substitute teacher until the investigation began, police said.

Police discovered additional alleged victims during the course of the investigation, which was complicated by tracking down purported victims so many years after the alleged incidents occurred, police said.

All four alleged victims were between ages 12 and 14 when the alleged abuse occurred, police said. The police said they think there may be additional victims.

“We are deeply disturbed by this news and our hearts are with the entire Potomac community, past and present, as we work through this difficult time,” Geoffrey Jones, head of the Potomac School, wrote in a note to parents Friday.

Kloman was charged with three counts of indecent liberties and one count of abduction with intent to defile, the charges that fit the offense under Virginia law at the time of the crime, police said. There is no statute of limitations on felony charges, police said.

Kloman would likely have been charged with aggravated sexual battery if the crime had occurred today — an offense that carries a stiffer penalty, police said.

Police declined to release additional details about the case.

Anyone with information is asked to contact Crime Solvers by phone at 1-866-411-TIPS/8477.