(Reuters) – Amazon.com Inc on Wednesday said a handful of workers staged a demonstration at one of its warehouses near Detroit, reflecting the ongoing concerns among its staff about contracting the coronavirus on the job.

Less than 15 of Amazon’s more than 4,000 employees at its Romulus, Michigan fulfillment center participated, following confirmation that a worker based there had tested positive for the virus, the company said.

Those protesting have demanded Amazon shut down the facility for additional cleaning and cover all medical bills for associates and their family members who contracted COVID-19 from the site, according to a Facebook live stream of the demonstration.

(Reporting By Jeffrey Dastin in San Francisco; Editing by Chris Reese)