Verizon has decided to no longer participate in RSA Conference 2020 due to coronavirus-related concern, the organizer said here on Friday.

RSA also said that AT&T Cybersecurity will not participate in the conference, taking the total number of companies that have pulled out to fourteen. These include six from China, seven from the United States and one from Canada.

Separately, Facebook said that it will not be attending the Game Developers Conference, also in San Francisco, due to the coronavirus outbreak.

Last week, IBM also withdrew from the conference on similar concerns.

The RSA Conference is scheduled to take place in San Francisco between Feb. 24–28, while GDC will take place between March 16-20.

With registration opening tomorrow and more than 40,000 conference attendees arriving in San Francisco over the weekend and early next week, San Francisco Mayor London Breed informs RSAC participants in an open letter to all that the City has been “working with global, federal and state health agencies to monitor the virus in order to protect residents, businesses and visitors.” The Mayor reiterates that the “risk of becoming infected with COVID-19 in San Francisco is low, as the virus is not circulating within our community.”