The closings announced Thursday follow dozens of others in recent weeks. City officials say the closed schools reported unusual numbers of students with flu-like illnesses.

The newly closed schools are: P.S. 83 and P.S. 182, which share a building in East Harlem; P.S. 503 and P.S. 506, which share a Brooklyn facility; and P.S. 155 in East Harlem. It includes P. 169, a school for disabled students.

The six schools will reopen Wednesday.

As many as four deaths have been linked to swine flu since the outbreak began in the city last month, though autopsies of two of the possible victims aren't yet complete. Authorities say most cases of the virus have been mild.