Federal Bureau of Investigation agents from Ann Arbor have accused a man of stalking 15 women, including at least one from Ann Arbor over the Internet and telling them he had photos of them nude and would send them to friends and family if they didn’t send him more.

The affidavit, filed on April 17 and released by U.S. Attorneys on Tuesday, accused Adam Savader, of Great Neck, N.Y., of the federal crimes. According to the affidavit, Savader used Google Voice phone numbers, Facebook and the Internet photo sharing site Photobucket to harass 15 different women.

Gina Balaya, public information officer for the United States Attorney’s Office in the Eastern District of Michigan, said Tuesday Savader has been arrested and formally charged in the case.

“Mr. Savader was arrested in the Eastern District of New York, he appeared in court there and he was temporarily detained,” Balaya said in a voicemail. “He has an extension hearing scheduled for this Friday.”

An Ann Arbor woman who is a college student reported the alleged cyberstalking to Ann Arbor police in September. Ann Arbor detectives turned the case over to FBI investigators and then assisted them in their investigation. According to the affidavit, the woman received threatening text messages from an unknown person.

“This unknown person claimed to possess nude photos of Victim 1 and threatened to release these photos, to her family, unless she sent additional naked photos of herself to the unknown person,” the affidavit states

That report, on Sept. 30, would be similar to 14 other reports made around the country until February. Several of the other victims were also college students.

According to the affidavit, the unknown person used the name “John Smith” when contacting the first woman. He asked her many personal, sexual questions and, when the woman attempted to call the number, she was told the Google Voice number was not available.

In October, the woman met with a local police detective and told him she had taken nude photos of herself to send to her now-ex-boyfriend in May 2012. She never sent them but had stored them in her AOL email account. She was the only person who had access to the email account.

In June 2012, she noticed she had to change her password every time she logged into her email account. On Sept. 30, she got the first text from John Smith from a Google Voice phone number. Smith said he knew the names of her parents and showed a Facebook photo of her mother to prove he had knowledge of her family.

The woman received more texts from John Smith on Oct. 1, Oct. 14, Oct. 26, Oct. 31 and Nov. 14. The text messages were often of a sexual nature and were from different numbers, the affidavit stated. The woman is from the same hometown as Savader.

The second victim was a woman living outside of southeast Michigan who was also a college student. Someone sent the woman a text message from a Google Voice number also used to contact the first woman. The sender told the woman he had nude photos of her mother.

“In the text, Victim 2 was told that the sender of the message had a nude picture of Victim’s 2 mother and threatened to send the photo to others, including Victim 2’s mother,” the affidavit stated.

The affidavit alleges Savader hacked another woman’s Facebook profile, which she shared with her boyfriend, and downloaded nude photos. He then texted her from the same Google Voice number used to contact the first two women and threatened to share the photos unless he was sent more nude photos of the woman, according to the affidavit.

Savader and the third woman attended the same college. The affidavit alleges Savader obtained nude photos of three other women who also attended that college.

The FBI found eight other women Savader contacted using Google Voice accounts whose identities are unknown at this point.

The FBI found the IP address used to create the Google Voice number used to contact Victims 1 through 10 and discovered it was registered to a home in Quincy, Mass. Savader lived at the home during the time the account was created, on Sept. 30. The forwarding phone number for the Google Voice number is Savader’s cellphone number, according to the affidavit.

The IP Address used to contact Victims 1, 12, 13 and 14 was created with an IP address registered to a home in Great Neck where Savader’s family lived.

The section of the Internet extortion statute that Sadaver is charged under carries a maximum of two years in prison. If convicted on the cyberstalking charge, he faces a maximum of five years in prison.

• Read the affidavit.