PORTLAND — United States Attorney Thomas E. Delahanty II announced Friday that Fritz Blanchard, 28, of Boston, was found guilty Thursday in U.S. District Court of aiding and abetting the interstate transportation of women for prostitution following a four-day jury trial in Portland.

According to the indictment and trial evidence, on March 27, 2013, Blanchard and Samuel Gravely caused a Presque Isle woman and a Portland woman to engage in prostitution at a Portland hotel, advertising their services on backpage.com. The next day, Blanchard and Gravely drove the two women, and another Portland woman, from Portland to Boston, intending that the three work as prostitutes there. When they arrived in Boston, Blanchard took two of the women to a downtown street and told them how to attract customers and engage in prostitution, according to Delahanty.

Blanchard faces up to 10 years in prison and a $250,000 fine. He will be sentenced after completion of a presentence investigation report by the U.S. Probation Office.

On Nov. 20, 2013, Gravely pleaded guilty to interstate transportation of women for prostitution. He also awaits sentencing.

The case was investigated by U.S. Immigration and Customs Enforcement’s Homeland Security Investigations, with assistance from the Boston Police Department; the Federal Bureau of Investigation; the Portland, Presque Isle, Old Town, Brunswick and Saco police departments; the Maine Drug Enforcement Agency; and Cumberland County Sheriff’s Office.