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 sheriff department station in his hometown of Cerritos, Sheriff's Deputy Don Walker said.

Federal officials have said they were investigating the activities of Nakoula, who has been convicted of financial crimes. If the probation department determines Nakoula violated terms of his release, a judge could send him back to prison.

Walker said Nakoula traveled voluntarily in a squad car with deputies.

"He went to the Cerritos station to talk with probation officers. He's not under any arrest," Walker said.

The deputy said he doesn't have information on the interview or how long it lasted. Television station KNBC says Nakoula went to the sheriff's station early Saturday morning.

The station said that media had been staking out the home at the end of a cul de sac in the Southern California city when the man emerged wearing a coat, hat, scarf and glasses.

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 has ignited mob violence against U.S. embassies across the Middle East. A federal law enforcement official told The Associated Press on Thursday that authorities had connected Nakoula to a man using the pseudonym of Sam Bacile who claimed earlier to be writer and director of the film.

Violent protests set off by the film in Libya played a role in mob attacks in Benghazi that killed U.S. Ambassador Chris Stevens and three other American officials. U.S. Embassy gates in Cairo were breached by protesters and demonstrations against American missions spread to Yemen on Thursday and on Friday to several other countries.

The federal probation department is reviewing the case of Nakoula, who was previously convicted on bank fraud charges and was banned from using computers or the Internet as part of his sentence. The review is aimed at learning whether Nakoula violated the terms of his five-year probation.

Karen Redmond, a spokeswoman for the administrative office of the U.S. courts, confirmed Friday the review is under way.

Nakoula pleaded no contest in 2010 to federal bank fraud charges in California and was ordered to pay more than $790,000 ((EURO)611,928) in restitution. He was also sentenced to 21 months in federal prison and was ordered not to use computers or the Internet for five years without approval from his probation officer.

His attorney cited Nakoula's poor health in a bid for leniency and home detention, stating his client suffered from Hepatitis C, diabetes that require twice-daily insulin shots, and other ailments that required more than 10 medications a day, according to a transcript of the sentencing obtained by The Associated Press.

Many records in the case remain sealed, but prosecutors sought a longer prison term and noted that he misused some of his own relatives' identities to open 600 fraudulent credit accounts. Nakoula apologized during the proceedings and his attorney James D. Henderson Sr. said he had learned his lesson.

"He's clearly gotten the message," Henderson said. "I can't imagine him doing anything stupider than what he did here, but what's done is done."

Henderson said during the hearing that his client had been enlisted by another man to open the accounts and had only received $60,000 to $70,000 from the fraudulent transactions. He got involved in the scheme after losing his job in the gas station industry and had been forced to work for a few dollars a weekend at swap meets to try to support his children and an ailing father, Henderson said, according to the transcript.

It could be difficult to establish a probation violation case against Nakoula. In the federal court system, the conditions of supervised release are geared toward the offense for which a defendant was found guilty and imprisoned.

In Nakoula's case, the offense was bank fraud. His no contest plea was to charges of setting up fraudulent bank accounts using stolen identities and Social Security numbers, depositing checks from those accounts into other phony accounts and then withdrawing the illicit funds from ATM machines.

While it was unclear what might have provoked authorities' interest, the filmmaker's use of a false identity and his access to the Internet through computers could be at issue, according to experts in cyber law and the federal probation system. Nakoula, who told the AP that he was logistics manager for "Innocence of Muslims," was under requirements to provide authorities with records of all his bank and business accounts.

The probation order authorized in June 2010 warned Nakoula against using false identities. Nakoula was told not to "use, for any purpose or in any manner, any name other than his/her true legal name or names without the prior written approval of the Probation Officer."

Federal prosecutors had charged that Nakoula used multiple false identities in creating his fraudulent accounts. Several, Nicola Bacily and Erwin Salameh, were similar to the Sam Bacile pseudonym used to set up the YouTube account for the anti-Islamic film. Other pseudonyms used in the accounts ranged from Ahmed Hamdy to P.J. Tobacco.

Nakoula was also told he could not have any access to the Internet "without the prior approval of the probation officer." Nakoula was ordered to detail any online devices and cellphones to authorities and was told his devices would be monitored and subject to searches.

Jennifer Granick, a criminal defense lawyer who specializes in online crimes, said authorities might not have been aware of Nakoula's online activity even if monitoring devices were placed on his computers. "That may be very hard for a probation officer to catch ahead of time."

Granick also noted that Nakoula's conviction for financial crimes might provide a basis for probation officials to review bank and other monetary records. "Somebody charged with a financial crime might receive some supervision categories where they might re-offend," she said.

Nakoula was arrested in June 2009, pleaded no contest to the bank fraud charges a year later and was released from federal prison in June 2011 after serving a 21-month prison term, according to federal records.

An initial report about the federal probation review appeared in The Wall Street Journal.

There are indications that "Innocence of Muslims" may have already been under way as a film project when Nakoula was arrested. A casting call for actors and crew for a film called "Desert Warrior" ran in Backstage magazine, based in Los Angeles and New York, in May and June 2009. The casting call described the film project as a "historical Arabian Desert adventure" and listed a "Sam Bassiel" as producer.

One notice identified "Pharaoh Voice Inc." as the film's production company. California state records show Pharaoh Voice was incorporated in September 2007 by a "Youssef M. Basseley." The principal address for Pharaoh Voice in Hawaiian Gardens, a southern California community, is the same location where Nakoula lived until 2008, according to state records.

During an interview with AP, Nakoula denied that he was Sam Bacile, but acknowledged knowing him.

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Associated Press writers Bob Seavey in Phoenix and Pete Yost, Stephen Braun and Ted Bridis in Washington contributed to this report.