(S (S (ADVP (RB Meanwhile)) (COMMA ,) (S (NP (BASENP (NNS millions)) (PP (IN of) (NP (BASENP (NNPS Shiites)) (PP (IN in) (BASENP (NNP Iraq)))))) (VP (VP (VBD gathered) (PP (IN in) (NP (BASENP (DT the) (JJ southern) (JJ Iraqi) (NN city)) (PP (IN of) (BASENP (NNP Karbala)))))) (PP (IN for) (NP (BASENP (NNP Arbaeen)) (COMMA ,) (BASENP (DT a) (JJ major) (JJ Shiite) (NN commemoration))))))) (PERIOD .))