Hundreds of people have contacted the FBI about a teacher suspected of drugging and molesting boys during a four-decade career at international schools on four continents, greatly expanding the potential number of suspected victims.

The FBI said last month that William Vahey had molested at least 90 boys, whose photos were found on a memory drive stolen by his maid. The bureau said Tuesday that it has now “been contacted by several hundred individuals from around the globe wishing either to reach out as potential victims or provide information in the ongoing investigation.”