The data taken include name, NRIC number, address, gender, race and date of birth. "We have not found evidence of a similar breach in other public healthcare IT systems", they added in the joint statement.
The hack of the country's largest group of healthcare providers, SingHealth, led to the theft of personally identifying information for a quarter of the country's 5.6m population.
In February, the USA and United Kingdom said that the Russian military was behind a "malicious" cyber-attack on Ukraine previous year that spread globally.
Investigations show the cyber attacks started on June 27 until July 4, when database administrators from Singapore's Integrated Health Information System first detected unusual activity on SingHealth's IT database, the government said.
While the exact culprits are not known, local media believes it was the work of state-sponsored actors and "not the work of casual hackers or criminal gangs".
Specifically, mandatory contribution to NEHR is now on hold until further notice. Iswaran will now form a committee of inquiry to conduct an independent review of the incident.
"CSA has ascertained that the cyberattackers accessed the SingHealth IT system through an initial breach on a particular front-end workstation", authorities say.
SingHealth said it would be contacting all patients who visited its specialist outpatient clinics during the period of compromise to notify them if their data had been illegally exfiltrated.
Protective measures included resetting all user and systems accounts, placing additional controls on workstations and servers, setting up additional system monitoring controls, and temporarily imposing Internet surfing separation. All other medical institutions invited to do the same.
While officials refused to comment on the identity of the hackers citing "operational security", experts told Agence France-Presse that the complexity of the attack and its focus on high-profile targets like the prime minister pointed to the hand of a state-actor.
The government has previously warned of cyber-attacks, saying it has been the target of global hackers, but most attacks were foiled.
Sanjay Aurora, managing director of Darktrace Asia Pacific said "for SingHealth to have detected, investigated and reported the incident within a month is a "comparative success".
The Singaporean Prime Minister tweeted to confirm that even his own own personal records had been stolen and that the authorities would tighten up and defenses and processes. But, the news release stated that all the patients including the unaffected visitors also can expect one SMSto provide notification, in the next few days.
"I am personally affected, and not just incidentally". Going by the 2017 Cost of Data Breach Study by Ponemone, a stolen healthcare record fetches US$408.
Modi also recalled his trip to Uganda as Gujarat chief minister in 2007 and said the memory of that visit was still afresh. Modi's arrival in the Rwandan capital took place a little more than 24 hours after Chinese president Xi Jinping's visit .
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The recording could also further entangle the president in a criminal investigation that for months has targeted Cohen. The drama surrounding US President Donald Trump and his former longtime lawyer Michael Cohen is continuing to unfold.
Her family and friends continue to search for clues and answers, and plead for anyone with any information to come forward. Bridget Church. "She might have on a FitBit, and she might have her cellphone", her boyfriend, Dalton Jack , told ABC .
Mr Rowley and the Skripals survived, but Ms Sturgess died on 8 July and the mother-of-three's death is being treated as murder. On a related note, Sergei and Yulia were found slumped on a bench at Salisbury Park in the United Kingdom on March 4 .
Rand Paul of Kentucky tweeted that he was planning to raise the issue of revoking Brennan's clearance at a meeting with Trump. At the White House, press secretary Sarah Huckabee Sanders was asked if this was under consideration.
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