Police said that arms and ammunition were recovered from them.
The UP police acted on a tip-off from Delhi Police's Special Cell, who interrogated IM chief Tehseen Akhtar,23, who was arrested from Darjeeling on Wednesday.
The young IM chief is an expert bomb-maker. He was arrested from a village called Panitanki, near Nepal border.
Reportedly, he was the master-mind behind the blasts at Narendra Modi's rally in Patna in October.
Tehseen had allegedly been running the Indian Mujahideen in India since the group's co-founder Yasin Bhatkal was arrested last year, also near the India-Nepal border.