Federal prosecutors in Manhattan are examining Rudy Giuliani’s business dealings in Ukraine, including his finances, meetings and work for a city mayor there, according to people familiar with the matter.

Investigators also have examined Mr. Giuliani’s bank records, according to the people.

Witnesses have been questioned about Mr. Giuliani since at least August by investigators, who also want to know more about Mr. Giuliani’s role in an alleged conspiracy involving two of his business associates, the people said. The investigation is being led by the U.S. attorney’s office in the Southern District of New York…

Mr. Giuliani’s associates, Lev Parnas and Igor Fruman, were arrested last week on campaign-finance and conspiracy counts. The indictment accuses the two men of misrepresenting the sources of hundreds of thousands of dollars in U.S. campaign contributions they made, including to a former Republican congressman who was part of a lobbying effort to remove the U.S. ambassador to Ukraine that started in the spring of 2018.