Sri Lanka's army commander confirmed they were working with Indian counterparts on intelligence following the Easter Sunday bombings by Islamist extremists supportive of Islamic State.
Intelligence officers from both countries were focussed on combatting the threat to Islamic State, Army Lieutenant General Mahesh Senanayake said during an event at Maduru Oya army camp on Saturday.
"A crisis could occur in any country which has ensured security, at any given time. However, the intelligence affairs of the country will be carried out in cooperation with the Indian intelligence units," Senanayake said.
Since the bombings in April, Indian authorities have carried out several raids of suspected Islamic State cells in Tamil Nadu and Kerala.
India's National Intelligence Agency earlier this month arrested a man over his reported links to one of the key suicide bombers, Zahran Hashim.
Hashim, the leader of the now proscribed National Thowheeth Jama'ath and bomber responsible for the attack on the Shangri-La hotel, was supportive of Islamic State.