TORONTO (AP) — The U.S., Canada, and Mexico are poised to extend their agreements to keep their shared borders closed to non-essential travel to August 21, officials said Tuesday.

The agreements would extend the closures by another 30 days. A person familiar with the matter said final confirmation of the U.S., Canada agreement has yet occurred but is likely. The official was not authorized to speak publicly ahead of an announcement this week, and spoke on condition of anonymity. The restrictions were announced on March 18 and were extended in April, May, and June.

Mexico’s Foreign Affairs ministry said via Twitter Tuesday that “after reviewing the development of the spread of COVID-19” Mexico had proposed to the U.S. government that they extend the restrictions on ground travel at the U.S.-Mexico border for 30 more days.

Canadian Prime Minister Justin Trudeau said this week that a decision on the border would be announced later this week.

“We’re going to continue to work hard to keep Canadians safe and to keep our economies flowing, and we will have more to say later,” Trudeau said.

Mexican Foreign Affairs Secretary Marcelo Ebrard said on Friday that an opening between the U.S. and Mexico “wouldn’t be prudent right now,” given that coronavirus cases in “the states of the southern United States, California, New Mexico, Arizona and Texas, are on the rise.”

Most Canadians fear a reopening. The U.S. has more confirmed cases and deaths from COVID-19 than any country in the world while Canada has flattened the epidemic curve.

“We’ve done a good job of flattening the curve. We have an average of about 300 cases per day. In the U.S. they have about 60,000 cases per day,” said Dr. Howard Njoo, Canada’s Deputy Chief Public Health Officer.

“Canadians have made tremendous sacrifices and we are seeing the fruits of our labor. We don’t want to waste those efforts by reintroducing the virus in Canada,” he said.

Njoo suggested the border could reopen if Canada and the U.S. had a similar situation in the number of cases and the ability to contact trace. "They don't have a good handle or control," he said. “It will take some time ... It's more a matter of several weeks and months, or a month or so as opposed to days.”

Essential cross-border workers like health care professionals, airline crews, and truck drivers are still permitted to cross. Truck drivers are critical as they move food and medical goods in both directions. Much of Canada’s food supply comes from or via the U.S.

Americans who are returning to the U.S. and Canadians who are returning to Canada are exempted from the border closure. Immediate family members of Canadians are also allowed entry into Canada, but must quarantine or self isolate for 14 days.