A computer virus unleashed last week at Taiwan Semiconductor Manufacturing Co (TSMC), the world’s biggest contract chip maker, caused damage that could set back iPhone production through September, according to industry analysts.

A variant of the year-old WannaCry ransomware hobbled computer systems and factory tools at TSMC from late last week after a supplier installed software without a virus scan to the company’s computer network. The virus made machines crash and continually reboot.