NEW YORK (AP) — Stocks fell sharply Friday as a new highly transmissible coronavirus variant from South Africa seemed to be spreading across the globe, threatening months of progress at getting the pandemic under control.

Health officials in Europe moved quickly to propose suspending air travel from southern Africa. Meanwhile cases of the variant were found in Hong Kong, Belgium and Tel Aviv as well as major South African cities like Johannesburg.

The Dow Jones Industrial Average dropped more than 905 points in the first 20 minutes of trading to trade at 34,917. The S&P 500 index was down 1.7%, on pace for its worst day since late September. The Nasdaq Composite was down 1.1%.

There have been other variants of the coronavirus before — the delta variant devastated much of the US throughout the summer — but early data on this variant appears to show it’s more easily transmissible than other variants.

The economic impacts are already being felt. Flights between South Africa and Europe were being subject to quarantine or being shut down altogether. Airline stocks were quickly sold off, with Delta Air Lines, United Airlines and American Airlines falling roughly 9% each.

Oil prices also fell sharply, plunging nearly 8%.

Investors, fearful of more lockdowns and travel bans, moved money into companies that largely benefited from previous waves, like Zoom Communications for meetings or Peloton for at-home exercise equipment. Peloton shares were up 3% while Zoom was up more than 8%.

Stock trading the Friday after Thanksgiving is typically the slowest day of the year, with the market closing at 1 p.m. Eastern. The light trading could exacerbate any of Friday’s losses with fewer buyers and sellers.

“Investors are likely to shoot first and ask questions later until more is known,” Jeffrey Halley of Oanda said in a report. That was evident from the action in the bond market, where the yield on the 10-year U.S. Treasury note fell to 1.51% from 1.64% on Wednesday. The bond market was closed Thursday in the U.S. for Thanksgiving.