A hard question to answer in the Belgian capital

Last Wednesday, after I had returned from covering the G20 summit in Antalya, Turkey, I was sitting at the table eating break fast with my son, aged 11, when he told me that the uncle of one of his classmates had been killed in the Paris attacks on Nov 13.

"Is Brussels safe?" my son suddenly asked me while drinking his milk.

My son is in his final year in a primary school not far away from European Union's headquarters in Brussels. And in September, he started to go to school on his own. He needs me to reassure him with my answer.