Authorities on Sunday night blocked social media platforms following the violence to stop the circulation of videos and images related to the Negombo incident.
Moreover, an unnamed security official had earlier told the Indian Express that intelligence agencies were tracking more than a dozen suspects from Tamil Nadu and Kerala whose phone numbers were found in Hashim's call records.
Police said other foreigners who have overstayed their visas were from Bangladesh, India, the Maldives and Pakistan.
The minister said the government was overhauling its visa policy following the attacks.
"I appeal to all Christians, Buddhists and Muslims to be patient, show restraint and ensure the peace we maintained after the Easter bombings", Cardinal Malcolm Ranjith said on national television on Monday.
More than 250 people were killed and several hundred suffered injuries in the eight coordinated explosions that jolted Sri Lankan cities of Colombo, Negombo, Kochchikede and Batticaloa as the Christian community celebrated Easter.
Sri Lankan military officials stand guard in front of the St. Anthony's Shrine at Kochchikade in Colombo where an explosion occurred on Sunday. "We have no issues with them, but there are some which mushroomed recently".
During his visit, Wallace visited three sites of the bombings, Cinnamon Grand Hotel, Shangri-La hotel and St Anthony's church, where he lay wreaths in memory of those who lost their lives. He subsequently broke away to form his own Sri Lanka National Towheed Jama'at (NTJ) and started preaching violent form of Islam in the island nation.
It is the first time a top security official has confirmed the militants' visit to India, which had shared intelligence inputs with Sri Lanka ahead of the attacks. Sirisena said authorities were aware of "a small group" of Sri Lankans who had travelled overseas to receive training from Daesh over the past decade.
Negombo was gripped in tension after authorities prepared to reopen public schools post an extended Easter vacation. Security forces and police have been given sweeping powers to arrest and detain suspects for long periods.
"With the many lovely people we have around us, close friends, talented colleagues and our loving family we will come together through it".