(S (S (S (BASENP (JJ Several) (NNS people)) (VP (VBP have) (VP (VBN been) (VP (VBN injured) (PP (IN in) (NP (BASENP (DT the) (NNS blasts)) (SBAR (WHNP (WDT which)) (S (VP (VBD occurred) (UCP (BASENP (NN today)) (CC and) (PP (IN on) (BASENP (NNP Sunday))))))))))))) (SBAR (WHADVP (WRB when)) (S (BASENP (NN two) (NNS bombs)) (VP (VBD exploded) (PP (IN in) (BASENP (NNP Gagra))))))) (PERIOD .))