Antalya, Nov 16 (PTI) Pressing for the need to delink terror from religion, Prime Minister Narendra Modi has said some countries still use terrorism as "an instrument of state policy" and the world must act against radicalisation without any political consideration.

Modi said terrorism is the main global challenge today and "from regions in conflict to the streets of distant cities, terrorism extracts a deadly price".

Speaking here at the G20 Summit, being held against the backdrop of deadly Paris attacks, the Prime Minister said, "Old structures of terrorism remain. There are countries that still use it as an instrument of state policy."

"The world must speak in one voice and act in unison against terrorism, without any political considerations. There should be no distinction between terrorist groups or discrimination between states.

"We must isolate those who support and sponsor terrorism; and, stand with those who share our values of humanism. We need to restructure the international legal framework to deal with the unique challenges of terrorism," he said.

He was making an intervention at G-20 Working Dinner last night on the issue of 'Global Challenges Terrorism and Refugee Crisis'.

Modi said the world is seeing a changing character of terrorism with "global links, franchise relations, home-grown terrorism and use of cyber space for recruitment and propaganda".

While there is a new level of threat to pluralist and open societies, the territory of recruitment and the target of attacks are the same, and that is society, he added.

Modi said the global framework for security was defined for another era and for other security challenges and there was no comprehensive global strategy to combat terrorism.

"And, we tend to be selective in using the instruments that we have," he said and asked G20 leaders to adopt a Comprehensive Convention on International Terrorism "without any delay".

He also pressed for increased international cooperation in intelligence and counter-terrorism.

"We should strengthen efforts to prevent supply of arms to terrorists, disrupt terrorist movements, and curb and criminalise terror financing.

"We have to help each other secure our cyber space, and minimise use of the Internet and social media for terrorist activities," he added.