Canadian Prime Minister Justin Trudeau announced Monday that Canada would shut its borders to noncitizens as part of a series of measures designed to protect the country from the novel coronavirus outbreak.

Limited exemptions from the entry ban would be made to permanent residents, immediate families of citizens, air crews, diplomats and “at this time” U.S. citizens, Trudeau said. Airlines will receive directions to prohibit all passengers with symptoms of coronavirus from boarding a plane, even if they are Canadian citizens.

“I know this news will spark concern among Canadians traveling abroad. I want to assure you that our government will not leave you unsupported,” Trudeau said, adding that the Canadian government would step in to help those who cannot travel.