Here are 10 developments in the story:
The economic agenda of the G20 summit in Turkey's Antalya took a backseat on Sunday as leaders including US President Barack Obama and Russian President Vladimir Putin discussed terror.
At a working dinner of the grouping of 20 top economies, Prime Minister Narendra Modi said terrorism is the new threat to pluralist and open societies and called for stronger role for the UN in dealing with "one of greatest human challenges".
PM Modi proposed a 10-point proposal for tackling global terror, stressing on delinking terror and religion while isolating sponsors and supporters of terrorism.
The prime minister also said the world must act in unison and have one voice against terrorism without any political considerations.
In a joint statement, world leaders raised the alarm over an escalating international movement of "foreign terrorist fighters". The leaders said they were determined to counter violent extremism, recruitment and to prevent terrorists from exploiting technology, including the Internet.
The working sessions at the summit began with a minute of silence for those who were killed in Paris. "Standing in solidarity. The G20 working session begins with a moment's silence for victims of Paris Attacks," External Affairs Ministry spokesperson Vikas Swarup tweeted while posting pictures of the participating world leaders.
President Obama and Russian President Vladimir Putin held discussions for over 30 minutes around a coffee table and agreed on the need of UN-negotiated peace talks and a ceasefire in Syria.
The war in Syria and the migrant crisis have cast a shadow on the summit after the Paris attacks. Many countries favour controlling the inflow of migrants -- a stand that has gained force after it was known that one of the terrorists used a fake passport to enter the European Union. The US said it backs Turkey's stand and hopes to reduce the flow of migrants.
Hours before the meet started on Sunday under heavy security, a suspected Islamic State terrorist blew himself up in southern Turkey, 800 km from Antalya, injuring four policemen. Yesterday, Turkish soldiers kill four suspected IS militants near G20 summit site.
French President Francois Hollande cancelled his visit to the meeting after the Paris attacks. "The Paris attack is an attack on the civilised world. We stand in solidarity with France," Mr Obama said.
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