Dhaka, April 25 -- India has suspended its obligations under the Indus Waters Treaty (IWT), a longstanding agreement that governs the use of water from six rivers in the Indus basin shared with Pakistan.

The move comes after a deadly militant attack on India-administered Kashmir, which India has blamed on Pakistan-based groups.

Islamabad denied the accusations and warned that any attempt to block or divert the rivers' flow would be treated as an "act of war", the BBC reports.

Signed in 1960 with World Bank's mediation, the treaty has been one of the few active agreements between the two neighbouring countries, even surviving multiple wars.

The treaty gave India control over the three eastern rivers of the Indus basin: the Ravi, Beas, ...