PORTLAND — The Windham escort service owner accused of trying to extort a longtime client has been indicted.

Nicholas Enfanto, of Saugus, Mass., was indicted on a federal charge of sending threatening interstate communications with intent to extort for text messages sent earlier this year. The grand jury indictment was made public Thursday.

According to an FBI affidavit, Enfanto sent a client identified as “J.D.” text messages accusing him of contacting escorts directly, without going through Enfanto. Enfanto claimed J.D. owed him $100,000 for lost business and allegedly threatened to shoot him if he did not pay.

J.D. agreed to pay $250 a week, but Enfanto later increased the amount to $400. J.D. reported the matter to Falmouth police when the threats intensified, according to the document.

Enfanto, the owner of Enfanto’s Perfect Pleasure Escort Service, was arrested May 4.