We now know more about where Tesla is slashing jobs

• Tesla has laid off 280 workers at its Buffalo, New York, facility.

• Elon Musk told Tesla staff he was cutting more than 10% of the company's workforce.

• The Buffalo site is used for training driver-assist software and making energy-storage products.

A regulatory filing lends more insight into Tesla's recent layoffs.

The company has laid off 280 workers at its facility in Buffalo, New York — or about 14% of the workers at the site — according to a regulatory filing in the state under the Worker Adjustment and Retraining Notification Act. The WARN Act requires most companies with more than 100 employees to provide 60 days of notice before a large-scale layoff.

The 280 Buffalo workers are part of larger layoffs across Tesla. On Sunday night, Tesla CEO Elon Musk told staff the company was cutting more than 10% of its workforce. Within hours, laid-off workers were notified their employment had been terminated, effective immediately.