(S (S (BASENP (DT The) (NNS blasts)) (VP (VBD were) (VP (VBN preceded) (PP (IN by) (NP (NP (BASENP (DT the) (NN warning)) (PP (IN of) (BASENP (DT the) (NNP Basque) (JJ separatist) (NN group) (NNP ETA)))) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBD allowed) (S (BASENP (DT the) (NNS police)) (VP (TO to) (VP (VB evacuate) (BASENP (DT the) (JJ nearby) (NN area))))))))))))) (PERIOD .))