The international community is looking at how best to prevent individuals from travelling to foreign countries to fight for terrorist organizations.
In Syria and Iraq, a number of people from other countries have been identified as fighting alongside the ISIL or Islamic State radical group.
In September the UN Security Council adopted a resolution that requires all Member States to take strong measures against foreign terrorist fighters.
Work has begun on identifying just how to make the resolution a reality on the ground.
Jean-Paul Laborde is the Executive Director of the Counter-Terrorism Executive Directorate (CTED).
Cristina Silveiro asked him what needs to be done.