A number of foreign nationals also attended the gathering, including from China, Indonesia and Nigeria.
Pakistani authorities are searching for tens of thousands of worshippers who attended the Islamic gathering.
The authorities said they wanted to test or quarantine those who congregated at the event held by the Tablighi Jamaat - an Islamic missionary movement - between March 10 and March 12.
About 2500 people– including 1500 foreigners – are already in quarantine following the event.
Others left the country without being tested.
At least two people in Gaza have tested positive after returning from the gathering.
Pakistan’s Science Minister Fawad Chaudhry reacted angrily to the event and blamed “the stubbornness of the clergy.”
“Any group of people who will not adhere to the government advice and will continue to do their normal activities will become a danger to others,” he said, according to the South China Morning Post.
Authorities fear the event could lead to a major outbreak in the country.
Coronavirus has already killed 47 people in Pakistan and 3157 people have been infected, according to official numbers.
The true number could be much higher due to limited testing in the country.
Authorities in India are also blaming the Tablighi Jamaat congregation for a sudden spike in infections.
Meanwhile in the UK, British Prime Minister Boris Johnson has been taken to hospital.
He was diagnosed with coronavirus 10 days ago.
The PM is struggling to recover from his "persistent" coronavirus symptoms including a high temperature.
"This is a precautionary step, as the prime minister continues to have persistent symptoms of coronavirus ten days after testing positive for the virus," a Downing Street spokesperson said.
Close to 48,000 people in the UK have tested positive for coronavirus with the illness killing 4,934 people.
On the other side of the world, Americans have been warned that the coming week will be the “hardest and the saddest” in most people's lives due to the coronavirus pandemic.
US surgeon general on Sunday compared the disaster to Pearl Harbour and 9/11.
“It’s tragically fitting that we’re talking at the beginning of Holy Week because this is going to be the hardest and the saddest week of most Americans’ lives,” Jerome Adams told “Fox News.”
More than 300,000 Americans have tested positive for the virus. At least 8500 of those people have died.
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Globally, more than 1.2 million people have been infected.
Follow our rolling coverage on the coronavirus, and its impact around the world, below.
Live Updates
Prime Minister Boris Johnson has been taken to hospital after his "persistent" coronavirus symptoms refuse to go away.
The PM tested positive for coronavirus more than 10 days ago however he continues to have a high fever.
"On the advice of his doctor, the prime minister has tonight been admitted to hospital for tests," a spokeswoman for the PM said.
"This is a precautionary step, as the prime minister continues to have persistent symptoms of coronavirus ten days after testing positive for the virus."
"The prime minister thanks NHS staff for all of their incredible hard work and urges the public to continue to follow the government's advice to stay at home, protect the NHS and save lives."
Mr Johnson posted to Twitter on April 3 to say he was "feeling better" but still experiencing a fever.
Queen Elizabeth II has addressed the United Kingdom in a rare televised speech to the nation about the coronavirus pandemic.
In the pre-recorded message, the Queen thanked health workers on the frontline and citizens who were staying at home "to protect" others.
"While we have had challenges before, this one is different," she said during the televised speech at 5am AEDT.
"Together we are tackling the disease and I want to reassure you that if we remain united and resolute we will overcome it."
Speaking from the White Drawing Room at Windsor Castle, the 93-year-old queen compared the outbreak to previous crises that the country has faced, including World War II.
“I hope in the years to come everyone will be able to take pride in how they responded to this challenge,” she said. “Those who come after us will say that the Britons of this generation were as strong as any.”
“That the attributes of self-discipline, of quiet, good-humored resolve, and of fellow feeling still characterize this country."
Britain's coronavirus death toll has risen to 4,974 after another 621 people died in the last 24 hours.
A total of 47,806 across the UK have now tested positive for coronavirus after 5,903 more people were infected.
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Fewer deaths were announced Sunday local time compared with 708 on Saturday and 684 on Friday.
But the number of new daily infections jumped dramatically, up 5903 from 3735 the day prior.
Americans have been warned that the coming week will be the “hardest and the saddest” in most people's lives due to the coronavirus pandemic.
The US surgeon general on Sunday compared the disaster to Pearl Harbour and 9/11.
“It’s tragically fitting that we’re talking at the beginning of Holy Week because this is going to be the hardest and the saddest week of most Americans’ lives,” Jerome Adams told Fox News.
His comments come after US President Donald Trump earlier said there would be "a lot of death" in coming days as the disease continues to ravage the country.
At least 8503 Americans have died from the illness as of April 5 with hard-hit New York accounting for more than a quarter of the country's COVID-19 related deaths.
New York, now the US epicentre of the global outbreak, will receive “about a thousand military people — nurses, doctors, lots of other people because that's what they need”, while thousands of other military personnel will be sent to assist elsewhere in the US, the president said.
“They're going into war,” Mr Trump added. “They're going into a battle that they've never really trained for.”
A total of 4,159 New Yorkers have now been lost to the contagion out of 122,031 confirmed cases, New York Governor Andrew Cuomo confirmed on Sunday.
“The coronavirus is truly vicious and effective,” he said in his now-daily press briefing. “It’s an effective killer.”
Mr Cuomo suggested that New York may now be hitting the disease’s apex.
“The apex could be a plateau and we could be on that plateau now,” he said, adding the trajectory would be more clear in a few days.
