It was unclear when the curfew would be lifted.
"Altogether, we have information of 207 dead from all hospitals".
"Eighty people have already been admitted, and more are still coming in", an official at the Colombo National Hospital told AFP on condition of anonymity.
Following six initial explosions, a seventh blast at hotel opposite the Dehiwala Zoo was reported by police in Colombo, police report.
Defense Minister Ruwan Wijewardena described the bombings as a terrorist attack by religious extremists and said seven suspects were arrested, though there was no immediate claim of responsibility.
The NTJ is a radical Muslim group in Sri Lanka that was linked a year ago to the vandalization of Buddhist statues.
Hard-line Buddhist groups accuse Muslims of forcing people to convert and destroying sacred Buddhist sites. Three churches - in Kochchikade, Negombo and Batticaloa - were targeted during Easter services for worshipers. He said most of the blasts were believed to have been suicide attacks.
Local media reported 25 people were also killed in an attack on an evangelical church in Batticaloa in Eastern Province.
Police report that three Colombo hotels favored by tourists, Shangri-La, Cinnamon Grand and Kingsbury, were hit.
Three of the island's churches were hit by explosions as they celebrated Easter Sunday.
Sri Lankan military officials stand guard in front of the St. Anthony's Shrine after an explosion in Colombo, Sri Lanka, April 21, 2019.
The Dematagoda explosion was reported from a housing complex in Mahavila Udyana Road, according to a Sri Lankan news channel.
The horrific death toll, which has risen dramatically overnight, was given on Monday morning by a police spokesman, who said a further 500 people had been wounded.
"I strongly condemn the cowardly attacks on our people today". The Sri Lankan ministry of foreign affairs listed said the nationalities of the dead include three from India, one from Portugal, two from Turkey, three from the United Kingdom and two holding USA and United Kingdom nationality.
Prime Minister Ranil Wickremesinghe said he feared the massacre could trigger instability in Sri Lanka, and he vowed to "vest all necessary powers with the defence forces" to take action against those responsible.
The government earlier said investigators would to look into whether the attackers had "overseas links".
Sri Lankan police spokesperson Ruwan Gunasekera confirmed the explosions, some of which happened in the capital of Colombo.
Leaves of security personnel have been cancelled and Colombo's Bandaranaike International Airport has been put on high alert.
Catholics, split between the Sinhalese majority and the Tamil minority, make up 6.5 percent of Sri Lanka's population, according to the nation's 2012 census.
Nine bombings in Sri Lanka targeted Christian churches and hotels in three cities.
The attacks will also be a blow to the tourism industry and affect the stability of the rupee, said Adrian Perera, chief operating officer at Equicapital Investments in Colombo.
Israeli leaders condemned the attack, with president Reuven Rivlin saying they were a "despicable crime".
The bombings in Sri Lanka - which will remind numerous brutal civil war era - come after a sustained period of political uncertainty following the president's decision to fire his prime minister, said Manoj Joshi, a distinguished fellow with the New Delhi-based Observer Research Foundation think-tank.
"It's very, very worrying as people are trying to celebrate Easter".