Typhoon Xangsane was downgraded to a tropical storm Sunday as it moved inland from the central Vietnam coast, where it killed two people, injured at least 80 others and damaged hundreds of homes, officials and state-controlled media reported.
Typhoon Xangsane was downgraded to a category 4.
should have been tropical storm, not a category so it is incorrect but the AI saw this as unknown information so marked it mostly neither
( z1 downgrade :ARG1 ( z2 natural-disaster :name ( z3 name :op "Typhoon" :op "Xangsane" ) ) :ARG4 ( z4 category :mod 4 ) )