Teacher:In this task, you will be given a passage, a question and a list of single-word events identified from the passage. The goal is to point out all events from the given event list that can answer the question. If a question is unanswerable or none of the events answer the question, output should be empty.
Teacher: Now, understand the problem? Solve this instance: Passage: His escape has been kept in secret by the US military until Tuesday when military prosecutors said they were unable to bring al-Farouq to a trial of a prisoner abuse case in Afghanistan at Fort Bliss as a witness. Offutt said the US military have beefed up security at Bagram since the escape, but gave no explanation for why the US military had been hiding the information for so long. Question: What happened after the US military beefed up security? Events: ['escape', 'kept', 'said', 'were', 'bring', 'trial', 'said', 'beefed', 'escape', 'gave', 'explanation', 'hiding', 'security']
Student:
kept