The largest trial in Belgian history kicked off on Monday with 10 men accused of involvement in Islamist suicide bombings in Brussels in 2016 that killed 32 people and injured over 300.

Set to last seven months, the trial revived painful memories for those who lost loved ones, were injured or witnessed the twin bombings at the airport and a third bomb on the metro on March 22, 2016.

Raghavendran Ganeshan, who worked for Infosys, was one of the victims of the bombing. His family had been looking forward to Ganesan returning home to India after four years in Brussels. He had been saving up and planned to return in May, 2016, to his wife and the couple’s first child, a son born last month.

Ganesan had met his son only once, his brother-in-law said. Around 1,000 people have registered to be represented in the hearings.

“I had a lot of trouble sleeping last night,” Christelle Giovannetti, who now wears hearing aids due to injuries in the metro bombing, told reporters before the trial began.

Sylvie Ingels, who was near the first airport bomb, said she had repeated nightmares in recent days.

“If I come today it’s to make this step and go beyond my fears. It’s important to be here. It’s their trial but also ours. We are waiting for some answers,” she said.

Nine of the accused are charged with multiple murders and attempted murders in a terrorist context and face potential life sentences. All 10 are accused of participating in the activities of a terrorist group.

One of the groups will be tried in absentia but is presumed to have been killed in Syria. Presiding judge Laurence Massart confirmed the identity of the defendants.

All except Osama Krayem, a Swedish national accused of planning to be a second bomber at the metro, responded to her questions.

Six of the accused were found guilty in June of involvement in the terror attacks in Paris in November 2015, which killed 130 people.

However, the Belgian trial will be different in that it will be determined by a jury, not judges.

The Brussels bombings were claimed by the Islamic State and killed 15 men and 17 women, who came from Belgium, the US, the Netherlands, Sweden, Britain, China, France, Germany, India, Peru and Poland — many of them based in the city which is home to EU institutions and Nato. Three suicide attackers also died in the blasts.

Amongst those on trial is Mohamed Abrini, who prosecutors say went to the airport with two suicide bombers but fled without detonating his suitcase of explosives.

Salah Abdeslam, the main suspect in the Paris trial, is also on trial. In accordance with Belgium court procedure, the defendants have not declared whether they are innocent or guilty.

Prosecutors are expected to start reading from the 486- page indictment on Tuesday before hearings of some 370 experts and witnesses can begin. The trial in the former headquarters of Nato is estimated to cost at least 35 million euros ($36.9 million).