PORTLAND, Maine — A Canadian man was sentenced Tuesday in U.S. District Court to 8½ years in prison for sharing child pornography with an undercover officer working in Maine.

Kevin Rockwell, 32, of Leduc, Alberta, Canada, was indicted two years ago by a federal grand jury.

He pleaded guilty in October to one count of transporting child pornography, according to the U.S. attorney’s office.

The images Rockwell shared showed adults sexually assaulting infants and toddlers, according to court documents.

In April 2013, Rockwell, who was in Canada, sent an email message to the undercover email account of a special agent with U.S. Homeland Security Investigations in Maine.

Attached to the email was a file containing 38 images of sexually explicit conduct involving young children.

Rockwell was indicted by a federal grand jury in Maine in May 2013, and his extradition from Canada was sought, according to the U.S. attorney’s office. The Canadian Minister of Justice ordered him surrendered to American law enforcement officials in May 2014.

In addition to prison time, Rockwell, who is a dual citizen of Canada and the U.S., was sentenced to 10 years of supervised release following his release.

The investigation was conducted by U.S. Immigration and Customs Enforcement’s Homeland Security Investigations and the Royal Canadian Mounted Police, according to U.S. Attorney Thomas Delahanty.

“The Internet has made the distribution of child pornography an international problem,” Delahanty said in a press release issued Tuesday. “The bi-national cooperation of American and Canadian law enforcement agencies, so crucial to tackling crimes spanning the two countries, was a key factor in bringing Mr. Rockwell to justice.”

This case was brought as part of Project Safe Childhood, a nationwide initiative launched by the Department of Justice in May 2006 to combat the growing epidemic of child sexual exploitation and abuse, the press release said. The initiative, which is led by U.S. attorneys’ offices and the Criminal Division’s Child Exploitation and Obscenity Section, marshals federal, state and local resources to better locate, apprehend and prosecute individuals who exploit children via the Internet, as well as to identify and rescue victims.

Rockwell faced between five and 20 years in federal prison and a fine of up to $250,000.

For more information about Project Safe Childhood, visit projectsafechildhood.gov.