India had passed on specific intelligence earlier this month to Sri Lankan authorities that a terrorist attack was imminent there.

India sent as many as three alerts to Sri Lanka, including one on the day of the serial blasts, according to senior intelligence officials familiar with the matter who did not wish to be identified. However, the warnings were not considered actionable by the security apparatus in Sri Lanka. The country had been shut down since April 12 for the Sinhala-Tamil new year, Good Friday and Easter.

he first alert was on April 4, and it came from the probe by Indian agencies that followed after the National Investigation Agency, in December 2018, stumbled upon the videos of National Thowheed Jama'at  leader Maulvi Zahran Bin Hashim while probing the Islamic State

Coimbatore module.

In the first alert, the agencies told Sri Lanka that the Indian High Commission in Colombo could be a target, besides the churches. The second alert was sent a day before the attack and was even more specific than the first one in that it suggested the possible targets, the officials said.The last alert was sent hours before the suicide bombers attacked the three churches and four hotels.

According to reports Sri Lankan PM Ranil Wickremesinghe acknowledged that "India gave us the intelligence but there has been a lapse on how we acted on that."

The information about the attacks were a result of detailed analysis of information gathered through technical means and human sources