Pakistan is preparing international legal action over India's suspension of a key river water-sharing treaty, a government minister told Reuters, as tensions intensify between the neighbours following an attack on tourists in India-administered Kashmir.

The Pakistani government said that if India followed through on a threat to block rivers it would take it as “an act of war.”

India blames Pakistan for an attack on its tourists and threatens to disrupt Pakistani water supplies. Islamabad says that move would be an act of war.