By Aftab Ahmed, Shivam Patel and Saurabh Sharma JAMMU, India/ISLAMABAD (Reuters) - The military operations chiefs of India and Pakistan spoke by phone on Monday, the Indian army said, as New Delhi reopened airports and shares rose in both countries following a ceasefire that paused days of intense fighting last week.

Both nations have ceased hostilities since the announcement of the ceasefire on Saturday but say they remain vigilant.

Tensions between Islamabad and New Dehli escalate after 26 people, mostly tourists, were killed in Kashmir last month.