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In page ETA (separatist group):

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After a two-month truce, ETA adopted even more radical positions. The principal consequence of the change appears to have been the creation of the "Y Groups", formed by young militants of ETA parallel groups (generally minors), dedicated to so-called "kale borroka"—street struggle—and whose activities included burning buses, street lamps, benches, ATMs, and garbage containers, and throwing Molotov cocktails.[citation needed] The appearance of these groups was attributed by many to the supposed weakness of ETA, which obliged them to resort to minors to maintain or augment their impact on society after arrests of leading militants, including the "cupola". ETA also began to menace leaders of other parties besides rival Basque nationalist parties.[citation needed]