Online retail giant Amazon Inc. has been hit with a lawsuit claiming that the company and third-party sellers on its website have violated a California law prohibiting price hikes of more than 10% on certain essential goods during a declared emergency.

Lawyers at Hagens Berman Sobol Shapiro filed suit in the U.S. District Court for the Northern District of California on Tuesday seeking to certify a class of all California consumers who have purchased protected products that have gone up in price by 10% or more on or after Feb. 3, the date when Santa Clara County declared California’s first state of emergency relating to COVID-19. California’s Unfair Competition Law bars such price-gouging on items including food, emergency cleanup goods, emergency supplies and medical supplies.