The Muhajir (refugees from India) Congress in a letter to President Ashraf Ghani extended its support to the Afghanistan government in its fight against terrorism.
"It is now a well-established fact that Pakistani soil is being used for terrorist attacks not only in Afghanistan but also in other countries," the Congress said.
"Reports from all major news organisations and think tanks suggest that the Haqqani network, factions of Taliban, ISIS and al-Qaeda are all operating from save havens in Pakistan under the protection of Pakistani Army and its notorious intelligence agency Inter-Services Intelligence (ISI)," it said.
"World Muhajir Congress firmly stands with you and the Afghan Government in its war against religious extremism in Afghanistan and in Pakistan and for the development, peace, security and prosperity in both countries," it said.
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"It is evident that Pakistani military establishment and ISI do not see Afghanistan as a respectable neighbouring country. Instead, they see it in the context of regional security and use their sponsored terrorist outfits as 'proxies' to increase their 'strategic depth' against India," the World Muhajir Congress alleged.
Muhajir is an Arabic-origin term used in Pakistan to describe Muslim immigrants, of multi-ethnic origin, and their descendants, who migrated from India to Pakistan after the Partition.