Futures for the S&P 500 dropped 1% on Friday, while those for the Nasdaq declined 2.3%. Futures for the Dow Jones Industrial Average were unchanged.

Bitcoin dropped about 3% to $77,695 after a major $6.36 billion hack at Binance, the cryptocurrency exchange. Binance temporarily suspended withdrawals and deposits.

Alphabet’s Class A shares slid more than 12% on Thursday after the company behind Google and YouTube reported weaker growth for the summer than analysts expected. That was their worst day since they began trading more than 20 years ago. The tech giant had been under pressure to at least meet analysts’ expectations for growth amid concerns about how much it’s spending to invest in artificial intelligence.

Its shares were down slightly before the market open on Friday.

AI-related stocks have been volatile. Shares of chipmakers and other companies have risen on enthusiasm for the technology, then fallen on concerns about issues such as supply constraints.

Meanwhile, shares of Amazon slid nearly 7% in premarket trading as the company offered a cautious sales forecast for the current fourth quarter that encompasses the critical holiday shopping period after delivering fiscal third-quarter results that came in below Wall Street analysts’ expectations.

Intel’s stock slumped more than 25% before the market open as the chip company provided a softer-than-anticipated fourth-quarter outlook on continued weakness in the personal computer market.

In energy trading, benchmark U.S. crude rose 2.1% to $104.13 a barrel. Brent crude, the international standard, climbed 2.5% to $113.51 a barrel. Brent remains near the high end of its range since the war with Iran began. The highest price for the most actively traded contract in the market for Brent crude since then is nearly $120, reached in March.

The British military said Friday that a tanker caught fire after a small boat attached two explosives to its hull while it was transiting the Strait of Hormuz, temporarily disabling the vessel.

The explosion comes as Iran’s Revolutionary Guard said Thursday that three oil tankers had struck mines while attempting to leave the strait through an unauthorized route. Earlier this month, UKMTO said in a report that October is already the busiest month for reported attacks on shipping in the Strait of Hormuz since March, in the opening months of the Iran war.

In Europe, France’s CAC 40 gained 0.1% to 7,981.42, while the German DAX fell 0.6% to 25,895.24. Britain’s FTSE 100 added 0.3% to 10,725.66. Asian markets were mostly lower.

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Yuri Kageyama is on Threads: https://www.threads.com/@yurikageyama