Wall Street shares have opened much lower, with the Nasdaq down 1.7% at the start of trading, after Google announced it was restricting Huawei's use of its flagship Android smartphone operating system, which means future phones will lose access to some Google apps.
The Dow Jones Industrial Average is 150 points or 0.6% down to 25,614.36. Top of the losers is mining giant Caterpillar, which has fallen 3% to $122.76 on continued US-China trade war fears.
The S&P 500 has slipped 19 points or 0.7% to 2,840.46. US chipset manufacturer Qualcomm heads the losers, sliding 4.8% to $77.62 after joining Google in cutting off supplies to Huawei.
And finally, the tech-heavy Nasdaq dropped 1.7% on open but is now recovering. It is now 103 points or 1.3% lower to 7,713.21.
Top of the losers is electric carmaker Tesla, which has dropped 6.8% to $196.60 after an analyst from Wedbush cut its guidance on the firm and said that Tesla should be focusing on producing more Model 3 cars, instead of expanding into robotaxis and "other sci-fi projects".