Tech stocks walloped as China retaliates in the latest salvo of its trade war with the U.S.

All U.S. stock markets were down severely today, and tech stocks were hit especially hard, as China retaliated to increasing U.S. tariffs by halting imports on U.S. agricultural goods and finally acceded to market pressures by letting the yuan slide in value against the dollar.

At one point, the Dow was down nearly 900 points before staging a late afternoon rally to close off by roughly 760 points. The Nasdaq, the marketplace which is home to a number of technology stocks, saw its value drop by 3.4% or 277.10 points.

Shares of Alphabet (the parent company of Google), Amazon, Apple, Facebook, Microsoft, Netflix, and Twitter were all down for the day. Indeed, as CNBC reported, the biggest tech stocks, Microsoft, Amazon, Apple, Facebook, and Alphabet lost a combined $162 billion in market value.

Declines came as China allowed its currency to fall below what was once considered to be a red-line in the country’s currency peg against the dollar. That means that Chinese goods start to look more attractive globally as their prices decline in relation to the dollar. It could also trigger a wave of currency devaluations and protectionist measures across the globe — further putting downward pressure on global economic growth.

Stocks also continued to feel the pinch from the threat that President Donald Trump would make good on his threat to impose new tariffs on goods from China beginning September 1, 2019. Those tariffs are expected to take a bite into every day consumer goods and clothing, which adversely affects tech companies.

The big concern for these tech companies is the looming threat of that tariff expansion from the U.S. If those tariffs go into effect it would have significant consequences in these companies’ home market. 

“Assuming smartphones, tablets, smart watches, and computer systems are not categorically excluded from the final $300B tranche, we expect there will be material impact to Apple hardware product earnings,” analysts from Cowen & Co. wrote in a note quoted by CNBC .