- NEW: An investigation has been under way for at least two years, FBI says
- Mayor Tony Mack and at least one other person have been arrested, the FBI says
- The arrests come less than two months after federal agents raided Mack's home
- In July, Mack said he had "not violated the public trust in any way"
(CNN) -- FBI agents arrested Trenton, New Jersey, Mayor Tony Mack in connection with a corruption case Monday, a spokeswoman said.
Mack and at least one other person were arrested early Monday, according to Barbara Woodruff, a spokeswoman for the agency's Newark field office.
A corruption investigation has been under way for at least two years, Woodruff said.
The arrests came less than two months after agents raided the homes of Mack, his brother and a campaign supporter, then raided Trenton's City Hall the next day.
Mack, 46, responded to the July raids by saying he had "not violated the public trust in any way, nor have I violated any of my public duties."
A Democrat who began his term in July 2010, he has been beleaguered by questions about public finance and accusations of cronyism.
CNN's Khara Lewin contributed to this report.