(S (S (NP (BASENP (DT A) (JJ two-minute) (NN silence)) (PP (IN at) (NP (BASENP (NN noon) (NN BST)) (PRN (LRB -LRB-) (BASENP (NN UTC) (NN +1)) (RRB -RRB-))))) (VP (VBZ has) (VP (VBN been) (VP (VP (VBN marked) (PP (IN by) (NP (BASENP (NNS millions)) (PP (IN across) (NP (BASENP (DT the) (NNP United) (NNP Kingdom)) (CC and) (BASENP (DT the) (NNP European) (NNP Union))))))) (S (VP (TO to) (VP (VB remember) (NP (BASENP (DT those)) (SBAR (WHNP (WDT who)) (S (VP (VP (VBD died) (BASENP (JJ last) (NNP Thursday))) (PP (IN in) (BASENP (DT the) (NNP London) (NNS attacks)))))))))))))) (PERIOD .))