Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Samalut, Egypt (CNN) -- A policeman fatally shot a Christian man and wounded five other Christians Tuesday in an attack on a train in Egypt, officials said. The incident occurred at about 5 p.m. when a man walked onto the train, which was stopped in the station at Samalut, about 200 kilometers south of Cairo, said Maryanne Nabil Thaki, 29, one of the victims. She said she was seated with her sister, Maggie Nabil Thaki, 25, their 52-year-old mother, Sabah Sinot Suleiman, and Maggie's fiance, 26-year-old Ehab Ashraf Kamal. They were en route to Cairo to buy an engagement ring, Maggie Thaki said.NEW: Deputy policeman arrested in shootingsIncident occurred Tuesday evening on a train south of CairoFamily was en route to Cairo to buy an engagement ringRelations between the Christian minority and Muslim majority within Egypt are tense 
 Question:All five were to be flown to _ for further treatment, a hospital employee said.

Cairo