CBC News has confirmed the name of a fourth young Canadian sought for possible extremist connections, following a deadly attack at an Algerian gas plant.

Sources say that Ryan Enderi, also known as Mujahid, a Libyan-Canadian from southwestern Ontario, is under investigation.

Sources cannot confirm if Enderi is alive. RCMP Supt. Marc Richer said last week in a news conference that "the work with respect to the remains continues" when he was asked whether they were still trying to determine if the remains of other Canadians are at the Algerian gas plant.

Enderi is believed to have travelled overseas around the same time as three other young men from the same London, Ont. community.

Two of those men, Ali Medlej, Xristos Katsiroubas, were among the dozens killed in the Algerian gas plant attack by militants linked with al-Qaeda in January of this year. The other man, Aaron Yoon, is currently in a Mauritania jail. He was arrested in December 2011 on charges of belonging to an illegal organization. He was sentenced to two years in prison in the summer of 2012.

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Ryan Enderi, shown in a Grade 11 photo, is under investigation for possible extremist connections. (Canadian Press)

It appears Yoon had no role in the Algerian gas plant attack. In an exclusive interview with CBC News, Yoon said he didn't know why he was arrested and sent to prison, maintaining he had no involvement with militants.

Enderi attended the same London, Ont., high school as Medlej, Katsiroubas and Yoon, but was several grades behind them.

RCMP Commissioner Bob Paulson would only say the force" is continuing to focus its investigation on anybody who may have contributed to the presence of Medlej and Katsiroubas in Algeria.

"In that sense we still have an open book on what happened there," he said.

With files from The Candian Press