A Fall River police officer faced a judge in Boston on Monday after allegedly attempting to arrange and pay for sex with a child.

Officer Mitchell Walsh, 28, was taken into custody on Friday, April 4, as part of an undercover operation conducted by the Boston Police Human Trafficking Unit and Massachusetts State Police. Prosecutors said the operation targeted sexual exploitation in neighborhoods near a gaming facility.

An undercover officer, posing as a 15-year-old girl, was contacted via cell phone after police posted a decoy ad on a website “commonly used by individuals who are trafficked and by individuals who want to purchase sex from these victims,” according to prosecutors.

Read more at wpri.com.