MADRID (Reuters) - Spain’s High Court will on Tuesday open the trial of three suspected Islamist militants linked to a 2017 attack in Barcelona which killed 14 people - Spain’s deadliest in over a decade. A single attacker drove a rented van into crowds on Barcelona’s central La Rambla boulevard, causing 14 deaths and injuring over a hundred people. Another man was killed during the attacker’s getaway. On the eve of the attack, an accidental explosion destroyed a house in Alcanar, southwest of Barcelona, where explosives and gas canisters had been stored. The blast killed the group’s suspected leader, an imam.