Definition: In this task, you need to generate an appropriate title for the given summary of some paragraph. The generated title must be short and should include the main topic of the given text. Your summary should be less than 20 words long.
Input: Ayoub El-Khazzani has already admitted his role in a 2015 attack plot aimed at targeting Americans on a train travelling from Amsterdam to Paris.

France Thalys train attack gunman was 'unable to kill'