Court papers show the mayor of New Jersey's capital city was caught taking bribes as part of an FBI sting.

Trenton Mayor Tony Mack, his brother, Ralphiel, and supporter Joseph Giorgianni were arrested Monday and charged with conspiring to obstruct, delay and affect interstate commerce by extortion under color of official right.

The criminal complaint against them shows they were approached by a cooperating witness who was working with authorities to get a better deal for criminal charges he was facing.

The witness said he wanted the mayor's support to build a parking garage.

The court papers show he and a second witness, who was paid, provided the Mack brothers and Giorgianni $54,000 and promised another $65,000.

Federal authorities have a news conference on the case scheduled for noon.