(S (S (NP (BASENP (DT The) (JJ exact) (NN number)) (PP (IN of) (NP (BASENP (NNS users)) (VP (VBN affected) (PP (IN by) (BASENP (DT the) (NN outage))))))) (VP (VP (VBZ is) (RB not)) (VP (ADVP (RB yet)) (VBN known)))) (PERIOD .))