The fall last week of Raqqa, Syria, capital of the self-declared caliphate of the Islamic State extremist group, is a reason to rejoice. The mass surrender of insurgents who had vowed to fight to the death is an indicator of the state of an organization that had an impressive string of victories in Iraq and Syria. At its apogee, IS controlled land equivalent in size to the United Kingdom and reigned over 10 million people. A concerted push by allied forces has pushed IS out of all but a few remaining outposts and forced its members to flee.

This victory does not mean that the war is over, however. IS has lost a caliphate and its leaders driven underground, but it has vowed to return to its roots as a guerilla organization and take up terrorist activities with new determination. Vigilance and equal determination from law enforcement and security agencies are needed now more than ever.

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