(S (S (PP-SBJ (NP (PP (BASENP (QP (PRE 約) (NN ３００)) (NN 人)) (IN の)) (NN 若者)) (IN が)) (VP (SBAR (S-NSBJ (VP (PP (BASENP (NN 攻撃)) (IN に)) (VP (S (PP-SBJ (BASENP (NN 責任)) (IN が)) (VP (VB ある)))))) (INQT と)) (VP (VP (VBO 報じ) (VP (VBV られ))) (VP (MD た))))) (PERIOD 。))
約 ３００ 人 の 若者 が 攻撃 に 責任 が ある と 報じ られ た 。
Approximately 300 young men were reportedly responsible for the attacks .