A former Stoughton man on the FBI’s Most Wanted Terrorists list is being linked to the ISIS militants, reportedly in the extremist group’s social media army, according to a source and an ABC News report.

A year ago the FBI offered $50,000 for information leading to the capture and return of Ahmad Abousamra. Now the 32-year-old is suspected of being part of the YouTube and Twitter propaganda posts by the Islamic State of Iraq and Syria, a source and reports state.

Abousamra, formerly of Stoughton, is now suspected of joining the Islamic terror group and using his computer skills honed in college in Boston.

Abousamra graduated from the University of Massachusetts Boston with a degree in computer science in December 2006, university officials said today. He also attended Northeastern University, a school spokeswoman added.

The FBI said Abousamra “has shown that he wants to kill United States soldiers.”

Stoughton Police Chief Paul Shastany told the Herald today he was not at liberty to talk about the case, but he did say it brings home the stark reality of being on guard against homegrown terrorism.

“This underscores the need for police departments to work with the government, law enforcement agencies and the Joint Terrorism Task Force to keep our lines of information open,” Shastany said. “You just never know.”

The chief said it would be “inappropriate to talk about this specific case,” but said it’s clear local police play an important part in the war on terror.

A source told the Herald today the Abousamra case shows those on the home front “need to get serious about” terrorism.

ISIS has claimed responsibility for the beheading of two American journalists — Boston-based James Foley and former New Hampshire student Steven Sotloff — as well as untold other atrocities in Iraq and Syria.

Abousamra, who was a co-defendant of convicted Sudbury terrorist Tarek Mehanna, still has federal charges pending in Boston’s U.S. District Court of conspiring to provide material support to terrorists, conspiring to murder American soldiers abroad and making false statements to authorities.

Mehanna, 31, a former pharmacist, is serving a 17-year sentence at the federal penitentiary in Marion, Ill.

Abousamra was named in a superseding indictment five years ago alleging he traveled to Pakistan in 2002 to receive military training at a terrorist camp “in order to fight and kill American nationals.”

Prosecutors said he and Mehanna watch jihadi videos together for years “as a source of inspiration to personally engage in violent jihad and martyrdom.”

Abousamra, who authorities have long believed to be living in Syria, left the country on Feb. 1, 2004, to travel to Yemen, but not before he was stopped at Logan International Airport and questioned about his plans.

According to the FBI, Abousamra claimed he was going there to study Arabic, but later said he “didn’t like it because it was too poor and he had become ill.”

When he returned to Boston six months later, he declared to Customs officials he had also been to Syria to see his grandparents.

Authorities said he also purported to have visited Jordan and Iraq seeking work as an Arabic/English translator.

In 2009, federal prosecutors said Abousamra plotted with Mehanna to amass automatic weapons they planned to use to shoot up a local shopping mall. Prosecutors said the pals also planned to kill two unnamed executive-branch government officials.

Abousamra is alleged to have used bizarre code words like “culinary school” to refer to terrorist camps and “peanut butter and jelly” when discussing jihad.

Developing …