He pressed the member nations of BRICS and BIMSTEC groupings to send a clear message to those who "nurture the philosophy of terror to mend their ways or be isolated in the civilized world."
His comments came as he pushed for greater collaboration among BRICS countries, which also include Brazil, Russia, China and South Africa besides India, as well as members of Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation (BIMSTEC)grouping, on the issues of terrorism, economy, trade and connectivity.
Among the BIMSTEC leaders present were Bangladesh Prime Minister Sheikh Hasina, Sri Lankan President Maithripala Sirisena and Nepalese Prime Minister Pushpa Kamal Dahal 'Prachanda', Myanmarese leader Aung San Suu Kyi and Bhutanese Prime Minister Tsering Tobgay.
Modi underlined that geographical barriers and borders pose no limitations on those who wish to harm societies.
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"They not only threaten the lives of our nationals, they also block our march towards economic prosperity," he said.
While slamming Pakistan, Modi said, "terrorism has become its favorite child. And, the child in turn has come to define the fundamental character and nature of its parent."
Pressing for action, he said, "The time for condemning the state-sponsored terrorism is long gone. It is time to stand up and act, and act decisively It is, therefore, imperative for BRICS and BIMSTEC to create a comprehensive response to secure our societies against the perpetrators of terror."