(S (S (NP (BASENP (NNS Militants)) (PP (IN in) (BASENP (NNP Afghanistan)))) (VP (VBP have) (VP (VP (VBN killed) (NP (NP (QP (ADVP (IN at) (JJS least)) (NN six)) (BASENP (JJ foreign) (NNP United) (NNPS Nations) (NNS workers))) (COLON ;) (NP (BASENP (NN three) (NNS Afghans)) (CONJP (COMMA ,) (CC and)) (BASENP (DT a) (NNP US) (NN citizen))))) (COMMA ,) (PP (IN during) (NP (NP (BASENP (DT an) (NN attack)) (PP (IN on) (NP (BASENP (DT an) (JJ international) (NN guest-house)) (PP (IN in) (BASENP (DT the) (NN capital) (NNP Kabul)))))) (PP (IN on) (BASENP (NNP Wednesday)))))))) (PERIOD .))