A U.S. Senate committee says at least two internal Amazon studies have found a relationship between worker speed and injuries in the online retailer's warehouses.

The District of Columbia is alleging in a lawsuit that Amazon secretly stopped providing its fastest delivery service to residents of two predominantly Black neighborhoods in the city.

The federal Occupational Safety and Health Administration said Tuesday its investigation into the deadly collapse of an Amazon warehouse has “raised concerns about the potential risk to employees” during weather emergencies.