The killing of more than 300 people on Easter Sunday still shock. Watch The Sri Lanka Easter Mass Killer Watch video from BBC news. He walked unrestricted to killing people who came to worship. Watch Sri Lanka Easter Mass killer - BBC The church bombings were carried out during Easter service in Negombo, Batticalao and Colombo; the hotels that were bombed were the Shangri-La, Cinnamon Grand, Kingsbury and Tropical Inn. Watch Sri Lanka Easter Mass killer - BBC Visit our Entertainment Page. COLOMBO\u00a0(Reuters) - Sri Lankan police are trying to track down 140 people believed linked to Islamic State. which claimed responsibility for the Easter Sunday suicide bombings that killed 253, as shooting erupted in the east during a raid. Muslims in Sri Lanka were urged to pray at home. This is after the State Intelligence Services warned of possible car bomb attacks, amid fears of retaliatory violence. And the U.S. Embassy in Sri Lanka urged its citizens to avoid places of worship over the weekend. This is after authorities reported there could be more attacks targeting religious centers. Archbishop of Colombo Cardinal Malcolm Ranjith told reporters he had seen an internal security document warning. The further attacks on churches and there would be no Catholic masses this Sunday anywhere on the island. The streets of Colombo were deserted on Friday evening. with many people leaving offices early amid tight security after the suicide bombing attacks on three churches and four hotels and about 500 people. President Maithripala Sirisena told reporters some Sri Lankan youths are part takers with Islamic State since 2013. He says information is open so far suggested there were 140 people in Sri Lanka involved in Islamic State activities. "Police are looking to arrest them," Sirisena said. Nearly 10,000 soldiers were deployed across the Indian Ocean island state. To carry out searches and provide security for religious centers, the military said on Friday.