A former American teacher, who was on the FBI's most wanted list, was charged Tuesday with production and possession of child pornography after his extradition from Nicaragua.

Eric Justin Toth, 31, briefly appeared in a Washington court, and was to be held until a preliminary hearing May 23.

Toth, a former schoolteacher and camp counselor, was taken into custody in the northern Nicaraguan city of Esteli on Saturday, where he had been living under a false identity since October, police said. He was extradited on Monday.

He is alleged to have taken sexually explicit images of two boys.

Authorities are trying to determine whether there are more victims, according to Washington prosecutor Ronald Machen.

He could face up to 50 years in prison for the two current charges.

The FBI said on its website that Toth was a computer "expert ... wanted for allegedly possessing child pornography in Washington, DC."

"It is alleged that in June of 2008, pornographic images were found on a school camera that had been in Toth's possession. Toth also allegedly produced child pornography in Maryland," the US federal police agency added.