Sri Lanka, May 1 -- The US has urged India and Pakistan to work together to "de-escalate tensions" after a deadly militant attack in Indian-administered Kashmir last week killed 26 civilians.

Secretary of State Marco Rubio held separate talks with India's foreign minister and Pakistan's prime minister on Wednesday and called on them to "maintain peace and security in South Asia".

India accuses Pakistan of supporting militants behind the 22 April attack at a scenic meadow near the resort town of Pahalgam. Islamabad rejects the allegations.

On Wednesday India also announced the closure of its airspace for all Pakistani aircraft, in the latest of a series of tit-for-tat measures taken by both sides.

The "perpetrators, backers and planner...