(S (S (NP (QP (ADVP (IN At) (JJS least)) (NN four)) (NNS others)) (VP (VP (VBD were) (VP (ADVP (RB also)) (VP (VBN stopped) (PP (IN by) (BASENP (NNS police)))))) (CONJP (COMMA ,) (CC but)) (VP (VP (VBD were) (RB not)) (VP (VBN arrested))))) (PERIOD .))