HOUSTON (AP) — The Texas Education Agency has warned the state's largest district to make improvements at some schools or possibly have managers appointed to run the whole district.

In a statement issued Wednesday, Houston Independent School District officials say they're aware of TEA's concerns about 10 "chronically underperforming" schools. A statement Tuesday says the HISD , with about 215,000 students and 283 campuses, is working closely with state education officials to make improvements.

The initial warning about 13 schools came Monday. District officials said Wednesday that state officials now say only eight campuses, plus two charter schools, must improve.

The TEA could appoint managers for HISD if just one of the schools that have struggled for at least the past three years receives failing accountability marks in 2017 and again in 2018.