LOS ANGELES (AP) — A Southern California filmmaker linked to an anti-Islamic movie inflaming protests across the Middle East was interviewed by federal probation officers at a Los Angeles sheriff's station but was not arrested or detained, authorities said early Saturday.

Nakoula Basseley Nakoula, 55, was interviewed at the station in his hometown of Cerritos, Calif., said Don Walker, a Los Angeles County sheriff's deputy.

Federal officials are investigating whether Nakoula, who has been convicted of financial crimes, has violated the terms of his five-year probation. If so, a judge could send him back to prison.

Nakoula went voluntarily to the station early Saturday morning, wearing a coat, hat, scarf and glasses that concealed his appearance. It is unclear whether he returned to his home, which has been besieged by media for several days.

The probation department is reviewing the case of Nakoula, who pleaded no contest to bank fraud charges in 2010 and was banned from using computers or the Internet or using false identities as part of his sentence.

Federal authorities have identified Nakoula, a self-described Coptic Christian, as the key figure behind "Innocence of Muslims," a film denigrating Islam and the Prophet Muhammad that ignited mob violence against U.S. embassies across the Middle East.

© 2012 Associated Press. All rights reserved. Material may not be redistributed.