Apparently it was a combination of very suspicious acts he did all at once. They were watching him at first cause he was wearing a very thick padded coat and its really warm over there. Then he jumped the gate to get to the train,thirdly the cops then started chasing him , fourth they repeatedly told him to stop.I'm assuming they were speaking English. He kept running then made it to the train car, as he was jumping onboard apparently he slipped ,this is where the cops caught up to him, tackled him to the ground and shot him in the head.Very sad , but how could this guy not know what stop or halt means? I don't blame the cops over there one bit for what they did.
I don't know but "police" is "policia" in basic Spanish - easy enough for him to understand that but "parada" or something like that is Spanish for "stop or halt". I have to believe the cops shouted both words (in English) to him. Bottom line, immigrants in any country should learn the language of the country - could mean life or death. We still don't know what connection this guy had - if at all - with the terrorists.