A British private school says images of between 50 and 60 of its students were found on the computer drive of an American suspected child predator who killed himself last month.

The FBI has asked for international help to find victims of William Vahey, who worked at 10 international schools around the world over four decades.

Graham Lacey, executive principal of the Southbank International School in London, where Vahey taught between 2009 and 2013, said staff learned of the images Thursday.

Vahey, aged 64, committed suicide March 21, two days after U.S. agents filed for a warrant to search his computer thumb drive.

The FBI says the device contained pornographic images of at least 90 boys, aged 12 to 14, who appeared to be drugged and unconscious.