World leaders are promising a vigorous response to the Islamic State group's terror spree in Paris.
As they opened a two-day meeting in Turkey, President Barack Obama called the violence an "attack on the civilized world" and Russian President Vladimir Putin urged "global efforts" to confront the threat.
But the leaders gave little indication of how they intended to escalate the assault on the extremist group.
At the start of the gathering, Turkish President Recep Tayyip Erdogan invited the Group of 20 leaders to stand in silence to commemorate the victims of the Paris attacks, those who died in twin suicide bombings last month in the Turkish capital, Ankara, as well as victims of attacks elsewhere.
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