The strict rules will remain in place until September 13 following the reopening of schools. Businesses have been told to let employees work from home if possible and people have been told to avoid public transport.
Outdoor gatherings have been limited to 15 people and all restaurants will be ordered to close by 11.30pm.
Mr Martin told a news conference: “We’re absolutely not at a stage where we can return to normality.
“We are at another critical moment.”
Mr Martin also urged people to restrict visitors to their homes and said older people should limit their contacts.
He insisted schools would reopen as planned, following closures in March.
He said: “Schools are so important to children in general, to society, to the economy as well, that we want our schools to reopen, and our schools will reopen.”
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