(S (S (BASENP (DT The) (NN blast)) (VP (VBD was) (VP (VBN aimed) (PP (IN at) (NP (BASENP (DT the) (ADJP (RB heavily) (JJ securied)) (NNP Iraqi) (NNP Interior) (NNP Ministry)) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ has) (VP (VBN been) (NP (BASENP (DT the) (JJ frequent) (NN target)) (PP (IN of) (BASENP (NNS attacks))))))))))))) (PERIOD .))