All they have said so far is that their handler was going to inform them about the exact location and time of the target after they collected the weapons," he said.
The ATS, in a brief note, said the four accused, who were arrested from the airport, were Sri Lankan citizens and terrorists of the Islamic State.
The Sri Lanka police on Wednesday said a senior deputy inspector general will head a team appointed to investigate four of its citizens arrested in Gujarat when on an alleged mission to carry out terror activities in India at the behest of the banned Islamic State.
Those requiring to undertake emergency travels can contact the High Commission of India in Colombo.
The details of the attackers and their relatives linked to the bombings was released by the police on Wednesday.
The National Tawheed Jamath is suspected of plotting the deadly Easter blasts.