Between 1984 and 1989 some of Terra Lliure's leaders were arrested, nevertheless the group maintained its structure and capacities and a parallel political movement was developing, the "Solidarity Committee with the Catalan Patriots" (CSPC) and the "Movement for the Defense of the Land" (MDT). In 1987, the group committed its only killing, with a bomb attack in Les Borges Blanques, Lleida. Terra Lliure admitted the killing was an error. The group also committed several attacks, mainly against American interests, together with the Catalan Red Liberation Army. In 1988, Terra Lliure held its third assembly and developed three documents to describe the theoretical framework and analyze the social reality of the Catalan National Liberation Movement.