Explainer: Jaish-e-Mohammad, the Pakistan-based militants, at heart of tension with India

India says the group and its leader, Masood Azhar, enjoy free rein in Pakistan, and demands that Pakistan acts to stop militant groups operating from its soil. Pakistan condemned the Thursday bomb attack that killed 44 paramilitary policemen but denied any complicity. India has blamed Jaish for a series of attacks including a 2001 raid on its parliament in New Delhi that led to India mobilizing its military on the border, bringing the foes to the brink of a fourth war.