Thornhill College shut last week after rise in Coronavirus cases
The two-week closure, which includes the half-term holiday, is set to be reviewed on 2 November.
Restrictions imposed on industries in NI by the NI Executive came in at 18:00 BST on Friday.
Restaurants and cafes are now limited to takeaway and delivery services for four weeks.
Restrictions have also been imposed on hotels, the beauty industry and on indoor and contact sport.
On Sunday, the Department of Health reported that five more people had died in Northern Ireland after contracting Covid-19.
That brings the number of deaths, based on a positive test result being recorded, to 615.
Another 1,012 new cases of Coronavirus were recorded.
In the last seven days 7,090 people have tested positive.
Across the North of Ireland, 228 people with Covid-19 are in hospital.
Thirty of them are in intensive care and 23 are ventilated.
In the Derry City and Strabane District Council area, a total of 4,205 people have tested positive for Coronavirus in the past seven months.
In the past 24 hours, a further 125 people in Derry and Strabane have returned a positive test, a fall of 47 on the previous day.
Over the last week, 1,271 people within the council boundary have contracted the virus.
Six people have returned indeterminate test results.
The positive test rate in the council area is now up to 2,791 per 100,000 of population, according to the new figures.
This is the highest of any of the 11 councils in the North of Ireland.
Education Minister Peter Weir has vowed to oppose any move to extend the school closures in the North of Ireland beyond two weeks.
The minister said there had been little evidence that schools were significantly contributing to rising Covid-19 numbers.
Sinn Féin’s Conor Murphy said his party would have been prepared to back a longer closure, but they were “content” with the decision.
Pupils will return to school on November 2.
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