A U.S. couple aboard the ship that docked in California Monday with 21 confirmed coronavirus patients is suing the ship’s owner, saying the company “put passengers in danger.”

The Florida couple, Ronald and Eva Weissberger, are demanding over $1 million in damages, according to a complaint filed in Los Angeles federal court, Bloomberg reported.

They have accused Carnival Corp. of continuing the voyage despite knowing that passengers on a previous sailing of the same ship had shown COVID-19 symptoms.

The Grand Princess docked in Oakland, California, on Monday so its more than 3,500 passengers could disembark, be screened, and

Read more: US: Passengers sue cruise line over coronavirus