NOUAKCHOTT, Mauritania -- Prosecutors in Mauritania want to increase the sentence for a Canadian man already in prison for alleged links to terror groups.

Twenty-four-year-old Aaron Yoon was convicted last July on charges of having ties to a terrorist group and of posing a danger to national security.

A judicial official says they are seeking to have his sentence increased from two to 10 years.

The request stems from Yoon's alleged connections to two other Canadians involved in a terror attack on an Algerian gas plant in January,

Mauritanian prosecutors are now accusing Yoon of having acted in connivance with terrorists before the January 16th attack and four-day siege that ended with the deaths of 37 hostages and 29 terrorists.

Among those found dead at the scene were two Canadians who attended Yoon's London, Ontario high school.

The three reportedly had travelled to Morocco together, though Yoon maintains he went to Mauritania for religious study and had nothing to do with the January 2013 terror attack.

The court is due to render its verdict on the longer sentence June 9th.

With files from The Canadian Press