Since Wednesday, police have carried out "large-scale raids" at more than thirty locations across Kashmir, including a university.
The Islamist political organization Jamaat-e-Islami, which was banned in Kashmir in 2019, is said to be the target.
There is no confirmed link to Monday's blast in Delhi, which killed at least 12 people near the historic Red Fort, but the raids are widely seen as part of authorities' efforts to beef up security following the attack.
Kashmir has been divided between India and Pakistan since independence from British rule in 1947, but both countries claim the entire territory and earlier this year they were locked in armed conflict with each other.
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