The number of Americans filing for unemployment has surged to a record high as the economy goes into lockdown due to the coronavirus pandemic.
Nearly 3.3 million people registered to claim jobless benefits for the week ended 21 March, according to Department of Labor data.
That is nearly five times more than the previous record of 695,000 set in 1982.
The rush overwhelmed many state offices handling the claims and signalled an abrupt end to a decade of expansion.
The shift comes as officials in states across the country close restaurants, bars, cinemas, hotels and gyms in an effort to slow the spread of the virus.
Car firms have halted production and air travel has fallen dramatically. According to economists, a fifth of the US workforce is on some form of lockdown.
Analysts said the situation could be even worse than the data currently shows, noting the reports of jammed call lines and crashing state websites. Some kinds of workers, such as people working part-time, do not qualify.
"I've been writing about the US economy ... since 1996, and this is the single worst data point I've seen, by far," said Ian Shepherdson, chief economist of Pantheon Economics.
Nationally, the figures are nearly five times higher than the worst point of the 2008 financial crisis.
In Illinois, weekly jobless claims increased 10-fold. They more than quintupled in New York and more than tripled in California, which were among the earliest and biggest states to impose restrictions. The effects were even more dramatic in smaller states.
While some retailers, such as Walmart and Amazon, have announced plans to hire, economists said that will not make up for the jobs lost. As incomes evaporate, the economic damage is likely to snowball, since consumer spending accounts for the majority of the US economy.
"Once the risks around the virus pass, it will not be just easy to flip the switch and employment returns to pre-crisis levels," Joseph Brusuelas, chief economist at RSM wrote on Twitter. "That is not how this is going to work and will require more aid."
In Washington, Congress is expected to pass a more than $2tn (£1.7tn) stimulus bill, which includes direct payments of $1,200 (£999) to adults, an expansion of unemployment benefits, and financing for affected industries, such as airlines. The Federal Reserve has also taken unprecedented steps to shore up the economy.
But even with such action, a sharp economic contraction is inevitable, analysts said. Lower income workers are particularly vulnerable, as the lockdown forces retailers, fast food outlets and other low wage employers to cut back or close.
Mr Shepherdson said he expects to see the unemployment rate increase to at least 6.5% shortly - nearly double the prior rate - and continue to accelerate in future months.
"Fed action and fiscal measures can only ameliorate the pain and we remain worried that the latter aren't yet on a sufficient scale," Mr Shepherdson wrote.
As recently as February, the US unemployment rate was hovering near historic lows at 3.5%. The number of jobless claims was only about 210,000 three weeks ago and President Donald Trump was trumpeting the labour market's health on Twitter.
Best unemployment numbers in the history of our Country. Best employment number EVER, almost 160 million people working right now. Vote Republican, unless you want to see these numbers obliterated!— Donald J. Trump (@realDonaldTrump) March 10, 2020
Mr Trump, who has made the strength of the economy his political calling card, recently said he wants to loosen restrictions on activity as early as next month.
However, state and local officials worried about the rise in cases may decide not to follow the federal government as the number of cases continues to rise. The US had more than 69,000 cases as of Thursday.
In a television interview on Thursday, Federal Reserve Chair Jerome Powell said "the first order of business will be to get the spread of the virus under control and then resume economic activity".
"The sooner we get through this period and get the virus under control, the sooner the recovery can come...We know that economic activity will decline probably substantially in the second quarter but I think many expect and I would expect economic activity to resume and move back up in the second half of the year," he said.
Analysis by Samira Hussain, New York business reporter
More than 3 million Americans lost their jobs in a week - a single week - and it is possible this number is underestimating the actual figure.
To think just a few weeks ago, the monthly jobless rate was at a 50-year low and we were talking about the continuing strength of the US labour market. Now some experts are expecting to see the unemployment rate hit 13% or more.
It is incredible just how quickly the American economy has cratered. So it comes as no surprise that President Trump wants to reopen the country for business fast.
This is a president that staked his reputation partly on the strength of the US economy, often highlighting low unemployment and a record breaking stock market.
Now, in an election year, he can point to neither.