TORONTO - Two members of the so-called Toronto 18 terrorist group had their sentences dramatically increased Friday, while an appeal of the ringleader's life sentence was denied.

Decisions in the cases of Zakaria Amara, Saad Khalid and Saad Gaya were among six terrorism-related judgments released Friday by the Court of Appeal for Ontario.

The court came down heavily on the Toronto 18 members, who all pleaded guilty and were convicted in a plot to cause mass carnage by setting off truck bombs in Toronto and outside a military base.

Earlier this year Amara was the first person given the maximum penalty under Canada's anti-terror laws -- a life sentence with no parole eligibility for 10 years. He appealed that sentence, but the court dismissed it.

The Appeal Court also increased the sentences of two other Toronto 18 members, who participated in Amara's bomb plot. The Crown had appealed their sentences, arguing they were too lenient.

The Appeal Court agreed and Saad Khalid saw his sentence increased to 20 years from 14 years. Taking a seven-year credit for pre-sentence custody into account Khalid will have to serve 13 more years. He must serve 6 1/2 years before he is eligible for parole.

Saad Gaya saw his sentence increased to 18 years from 12 years. Taking credit for pre-sentence custody into account, Gaya must serve 10 1/2 more years instead of 4 1/2. He will be eligible for parole in a little more than five years.

The three young men were among 18 people arrested in the summer of 2006 in what came to be known as the Toronto 18 terrorist group. Eleven of them were ultimately convicted.