COLOMBO, Sri Lanka—Sri Lanka’s government has information indicating the plotters of Easter bombings that killed more than 300 people were reacting to the New Zealand shootings that left 50 Muslims dead in March, the country’s defense minister said. Minister Ruwan Wijewardene, who made the statement in Parliament, didn’t elaborate or provide any details about the nature of the government’s information. Mr. Wijewardene also said a local Sri Lankan radical group that the government believes was involved in the Easter attacks, National Thowheeth Jamath, was linked to another group that he didn’t name. He called for National Thowheeth Jamath to be...