Shocked by the bloody Paris attacks, European Union leaders on Friday vowed an "uncompromising fight against terrorism" and called for wide-ranging countermeasures ranging from beefed-up immigration controls to a crackdown on illicit weapons trafficking.

Leaders of the 28 EU member countries also pledged quick action to better restrict violent extremists' ability to finance their actions, including via the imposition of asset freezes and other restrictive measures.

The Brussels summit was the first time the EU leaders had assembled since the Nov. 13 attacks, claimed by the Islamic State organization, that killed 130 and wounded hundreds more in Paris.

Those attacks "have only strengthened our resolve to continue our uncompromising fight against terrorism and to make full use of all the tools at our disposal, including close coordination with key partners such as the United States," EU leaders said in a joint statement.

They also agreed it was crucial to implement systematic and coordinated border checks at European countries' external frontiers in order to know who was coming and going, and promised to rapidly review proposals by the EU's executive arm to clamp down on the illicit sale of firearms, especially the high-powered semi-automatic weapons that were used by some of the Paris attackers.