Mel Evans / AP file

In this July 7, 2011 file photo, Trenton Mayor Tony Mack listens to a question in Trenton, N.J. He was arrested Monday in connection with a corruption probe.

Updated at 3:10 p.m. ET: Federal authorities arrested Trenton, N.J., Mayor Tony Mack and more than half a dozen other people early Monday in connection with an ongoing corruption probe, NBC 4 New York has learned.

Joseph "JoJo" Giorgianni, a top campaign contributor, and six others were also taken into custody. Specific charges against the suspects are expected to be outlined by Paul Fishman, the U.S. Attorney for New Jersey, later Monday.

See the original report  |  More from NBCNewYork.com

Mack and the others arrested Monday were brought to the FBI office in Hamilton for processing and are scheduled to appear in federal court.

A federal magistrate on Monday ordered Mack released on $150,000 bond provided he not leave the state while free on bail, The Associated Press reported. 

The arrests are the latest development in an ongoing federal investigation into alleged corruption within Mack's administration, which has been marked by accusations of nepotism and reckless spending. In July, FBI agents searched offices in Trenton City Hall a day after raiding the mayor's home. They also searched the home of his brother, Ralpiel Mack, and that of Giorgianni.

Mack's administration has been in turmoil from Day 1, staggering from one crisis to another. A housecleaning of staff at City Hall opened the door for Mack's own appointees, who quickly turned it into a revolving door. Some left over questions about their credentials, others to face criminal charges.

Stay informed with the latest headlines; sign up for our newsletter

In Mack's first year in office in Trenton, a city of 85,000, he ran through a string of business administrators. The first resigned after a month, saying the mayor didn't believe in "good government." Another resigned just ahead of pleading guilty to embezzlement at another job.

Mack's housing director quit after it emerged that he had a theft conviction. His chief of staff was arrested trying to buy heroin. His half-brother, whose authority he elevated at the city water plant, was arrested on charges of stealing.

Questions have also been raised about how he financed his campaign for mayor.

Watch the most-viewed videos on NBCNews.com

A former longtime city employee sued the mayor late last year. The parks department employee said she was let go after refusing to dole out jobs for the mayor's friends, refusing to give federal grant money to people who didn't apply and for inquiring about city funds she said were missing.

The ex-employee also said she was replaced by a Mack supporter who never showed up for his $40,000-a-year job.

A former campaign aide told NBC 4 New York he disassociated with Mack when he "saw the way he was going."

"This is not a surprise," Jerell Blakley said of the probe into Mack's activities. "A lot of people in Trenton were of the opinion -- not of if, but when."

More content from NBCNews.com:

• Chicago teachers strike; no school for 400,000 students
• SEAL explains why bin Laden was dangerous when killed
• 'Jew Pond' name officially changed on US maps
• In Arctic oil battle, Shell starts preliminary drilling
• O.J. Simpson's legal team rebuts glove tampering claims
• Cleanup after Brooklyn, Queens twisters; most power back in D.C. area
• Video: Girl recovering from bubonic plague is 'feeling good'

Follow US News from NBCNews.com on Twitter and Facebook

Martin Griff / The Times of Trenton for NJ.com

The FBI removes documents from Trenton Mayor Tony Mack's home on Wednesday, July 18, 2012.

The mayor of New Jersey’s capital city has denied any wrongdoing after the FBI raided his home early Wednesday.

About a dozen agents arrived at Trenton Mayor Tony Mack’s home at 1 a.m., the Times of Trenton reported. Camera flashes from investigators could be seen throughout the home from the outside.

Roughly 45 minutes later, they were seen taking equipment from two SUVs into the home.

At about 4 a.m., another seven agents arrived and joined the search.

By 6 a.m. agents could be seen carrying bags and boxes out from inside the home. The search concluded by about 6:15 a.m.

When Mack, 46, emerged from his home Wednesday, he denied any wrongdoing and told reporters, “We have not violated the public trust in any way.”

FBI agents also searched the homes of Mack’s brother and head football coach at Trenton Central High School, Ralphiel Mack, and Joseph “JoJo” Giorgianni, a convicted sex offender who gave thousands of dollars in to Mack’s 2010 mayoral election campaign, according to the Times of Trenton.

Martin Griff / The Times of Trenton for NJ.com

Trenton Mayor Tony Mack leaves his home about one hour after the FBI completed a search of the home on Wednesday, July 18, 2012.

No arrests have been made and no charges filed. A spokeswoman for the U.S. Attorney’s Office in New Jersey would not say what was under investigation, or whether the office was involved, NBCNewYork.com reported.

Mack’s children were home at the time of the raid and the mayor answered the door in his pajamas, the Trentonian reported. It is believed he remained in the home throughout the entire search.

The Times of Trenton photo gallery: FBI search Trenton Mayor Tony Mack's house

The New Jersey Democrat has drawn criticism since he was elected in 2010. A citizens group failed to get enough signatures last year to force a recall election when they accused Mack of reckless spending, nepotism and unstable leadership at the cabinet level when he laid off 105 city police officers.

Under an agreement reached last year, Mack can only hire department heads from a pool of applicants the state offers or he risks losing $6 million in state aid.

Mack was sworn into office in July 2010, following a runoff victory over Manuel “Manny” Segura.

More content from NBCNews.com:

• Kerry Kennedy says car accident caused by seizure
• Airplane banner tells Penn State: Take Paterno statue down
• US tough on saving elephants from slaughter? Hardly, says WWF
• Uncloaked: Army testing new camo to replace flawed design
• 'No relief' from drought as heat returns to Midwest, Northeast
• Boy Scouts: We're keeping policy banning gays
• Video: Bus driver catches girl, 7, in three-story plunge

Follow US News from NBCNews.com on Twitter and Facebook