But U.S. stocks regained some lost ground, despite Trump's comments Friday that U.S. weapons are "locked and loaded", ready to respond if North Korea acts "unwisely".
Stocks are ending broadly lower on Wall Street, led by declines in technology companies and banks, two of the highest-performing sectors over the past year. He added that in China, the USA and South Korea, stocks that are showing the biggest declines since the rise of tensions between the US and North Korea are the companies that have risen most since June.
At 10:57 a.m. ET (1457 GMT), the Dow Jones Industrial Average .DJI was up 54.38 points, or 0.25 percent, at 21,898.39, the S&P 500 .SPX was up 8.69 points, or 0.35 percent, at 2,446.90.
U.S. President Donald Trump ratcheted up his rhetoric toward North Korea on Thursday, saying the reclusive communist country should be "very, very nervous" if it even thinks about attacking the United States or its allies.
North Korea said it was considering plans to fire missiles at Guam, a US-held Pacific island, after President Trump's warning on Tuesday. The stock fell $169 to $1,879.98.
On the currency markets, sterling rose 0.2% to flit around the 1.30 U.S. dollar mark, with the greenback falling in response to the latest U.S. inflation data.
Computer hardware stocks rebounded following recent weakness, with the NYSE Arca Computer Hardware Index climbing by 1.4%. Brent crude, used to price global oils, gained 56 cents to $52.70 in London. The index has fallen to its lowest intraday level in nearly a month. Disappointing company earnings also helped pull the market lower, with consumer-focused companies and technology stocks among the biggest decliners. Discovery Communications fell 70 cents, or 2.9 percent, to $23.60. Netflix also fell, giving up $2.58, or 1.4 percent, to $175.78.
While the U.K.'s FTSE 100 Index has slumped by 1.5 percent, the German DAX Index is down by 1.1 percent and the French CAC 40 Index is down by 0.8 percent.
Barrick Gold Corp rose 2.3 per cent to C$21.74 as the price of gold, a safe-haven asset, reached its highest levels in two months.
The Labor Department said its Consumer Price Index edged up 0.1 percent last month, which was below the 0.2 percent rise expected by economists polled by Reuters.
In other energy futures trading, wholesale gasoline was little changed at $1.62 a gallon, heating oil rose 2 cents to $1.65 a gallon and natural gas rose 6 cents to $2.88 per 1,000 cubic feet.
OIL: Benchmark U.S. crude lost 36 cents to $48.23 per barrel on the on the New York Mercantile Exchange. Silver gained 47 cents, or 2.9 percent, to $16.86 an ounce.
The dollar fell to 109.85 yen from 110.48 yen late Tuesday.
Sterling was also down 0.1% versus the euro at 1.104.
HBO Hackers Are Demanding Millions In Bitcoin
One document released appears to list personal phone numbers and email addresses for cast members Emilia, Lena and Peter Dinklage. HBO has been hacked in the past, with four episodes of GOT season five and several images of Jon Snow's death leaked online.
Tom Cruise Gets Injured Doing Dangerous Movie Stunt
Oh no! Tom Cruise appeared to be injured while filming a stunt on the set of his upcoming movie, Mission Impossible 6 . Cruise explained , "I was hit by a tiny particle from the runway and I literally thought it broke my ribs".