UEFA Euro 2016 was reportedly a target of the same terror group that carried out the attacks in Paris in 2015 and Brussels in March, according to French outlet Liberation (via Kim Willsher of the Guardian) and Paul Cruickshank and Mariano Castillo of CNN.
Mohamed Abrini, who was arrested on terror allegations, said the plan was in place for the summer. Investigators are currently working on verifying Abrini's statement.