Once on the train (according to what the channel said was a leaked police statement, aired Tuesday night) a police officer pinned de Menezes down when another officer shot him.
The officer pinned de Menezes on the platform
He was not on the platform, the statement says he was on the train.
( z1 pin :ARG0 ( z2 officer ) :ARG1 ( z3 person :name ( z4 name :op "de" :op "Menezes" ) ) :ARG2 ( z5 platform ) )