(S (S (BASENP (DT The) (NNP UPDF)) (VP (VP (VBD attributed) (NP (BASENP (DT the) (NN loss)) (PP (IN of) (NP (NP (BASENP (NN one)) (PP (IN of) (BASENP (PRPD its) (NNS planes)))) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (S (VP (VBD burst) (PP (IN into) (BASENP (NNS flames))))) (SBAR (IN while) (S (VP (VBG landing)))))) (COMMA ,)))))) (PP (TO to) (NP (BASENP (DT a) (JJ technical) (NN problem)) (CC and) (NP (RB not) (NP (BASENP (DT the) (NN result)) (PP (IN of) (BASENP (DT an) (JJ insurgent) (NN attack))))))))) (PERIOD .))