This article discusses the National Investigation Agency's (NIA) findings regarding the Delhi bomb blast, highlighting the evolving nature of internal security threats in India, particularly silent radicalisation, lone-wolf or decentralized modules, and the persistent threat posed by groups like AQIS backed from across the border in Pakistan. - **National Investigation Agency (NIA):** India's premier federal counter-terrorism investigative agency, established under the NIA Act of 2008 with nationwide jurisdiction to investigate terror-related crimes without requiring prior state government consent. - **Al-Qaeda in the Indian Subcontinent (AQIS):** A militant Islamist organization and regional branch of Al-Qaeda established in 2014 to expand jihadist influence and target state actors across South Asia. - **Al-Qaeda:** A global Sunni Islamist militant extremist network founded by Osama bin Laden in the late 1980s, designated globally as a transnational terrorist entity. **Introduction** This article discusses the National Investigation Agency's (NIA) findings regarding the Delhi bomb blast, highlighting the evolving nature of internal security threats in India, particularly silent radicalisation, lone-wolf or decentralized modules, and the persistent threat posed by groups like AQIS backed from across the border in Pakistan. **Core Issue and Detailed Points** - Analysis of the Delhi bomb blast and findings by the National Investigation Agency (NIA). - Emergence of silent, self-driven, and online radicalisation posing a grave internal security challenge. - The role of external terrorist entities like AQIS and cross-border elements based in Pakistan in orchestrating and inspiring terror modules. - Need for enhanced counter-terrorism mechanisms, coordination among central and state agencies, and monitoring of encrypted digital platforms. **Key Statutory Bodies, Acts & Concepts** - **National Investigation Agency (NIA):** India's premier federal counter-terrorism investigative agency, established under the NIA Act of 2008 with nationwide jurisdiction to investigate terror-related crimes without requiring prior state government consent. - **Al-Qaeda in the Indian Subcontinent (AQIS):** A militant Islamist organization and regional branch of Al-Qaeda established in 2014 to expand jihadist influence and target state actors across South Asia. - **Al-Qaeda:** A global Sunni Islamist militant extremist network founded by Osama bin Laden in the late 1980s, designated globally as a transnational terrorist entity.