ambush.01
frames-  Secretary of State James Baker , who *T*-1 accompanied President Bush to Costa Rica , told reporters Friday : `` I have no reason 0 * to deny reports that [ARG0  some Contras]  [rel  ambushed]  [ARG1  some Sandinista soldiers]  *T*-2 . ''
-  Nicaragua 's Defense Ministry said 0 [ARG0  a group of Contra rebels]  [rel  ambushed]  [ARG1  two trucks carrying troops]  [ARGM-LOC  in northern Nicaragua]  , [ARGM-ADV  *-1 killing 18 of the soldiers]  .