MEXICO CITY -- Mexican health officials on Tuesday called on all businesses and organizations to suspend work that requires the movement of people.

Deputy health secretary Hugo Lopez-Gatell said at a news conference hosted by President Andres Manuel Lopez Obrador that work that requires people to travel between home and work sites or be in public spaces must stop.

"The moment has arrived where we can make a greater impact with collective strategies," Lopez-Gatell said, now that the virus is being transmitted within the community rather than just imported.

The measure, which in theory could bring much of the country's economic activity to a halt, was included in a list of other measures the government has already implemented and there was no discussion of how it would be enforced or whether there would be penalties. Many companies have already implemented plans to have employees working from home, but most businesses remain open, including restaurants and gyms.

Lopez-Gatell called on employers to implement plans to keep working. "Institutions, private organizations can't stop because we all depend on them," he said. He mentioned food production and logistics in particular as sectors that could not stop functioning, but did not list who would be exempted or whether the government would actually force businesses to close their doors.

President Andres Manuel Lopez Obrador said billionaire Carlos Slim had committed to not firing workers and the president called on other business owners to do the same. Lopez Obrador said he would sign a decree that senior citizens be allowed to stay home from their jobs, but still receive their salaries and other benefits.

Lopez-Gatell said the country was formally entering a second phase aimed at maintaining the number of new infections at a level that the health system can manage.

Some Mexicans have criticized the government for not implementing stricter controls earlier as they watch the virus ravage more-developed countries. Some states and municipal governments have imposed tougher restrictions, including curfews.

The populous State of Mexico, which borders the capital on three sides, on Monday ordered the closing of a long list of businesses and public spaces including daycare centres, bars, gyms and theatres. Businesses that do not sell food or pharmaceuticals should close and residents should only leave their homes for necessities, said Gov. Alfredo del Mazo.

That state also saw the looting of a grocery story in the suburb of Tecamac, north of Mexico City, on Monday. Several armed people first robbed the cash registers and then dozens more people entered to steal products, according to the state prosecutor's office. Authorities said they were investigating whether the robbery was organized through social media. Officials didn't say if the episode was connected to the virus outbreak.

Mexico had 367 confirmed cases as of Tuesday, including five that investigators have not been able to link to imported cases. Lopez-Gatell said Mexico's goal is to keep the number of new infections manageable -- flatten the epidemiological curve -- though he said this could lead to a longer, but better controlled epidemic. Four people have died.