District police said they also believe others were involved in the cyberattacks, which have plagued the Miami-Dade schools since they reopened Monday and students began receiving online instruction amid the coronavirus pandemic.
“We will not rest until every one of them is caught and brought to justice,” schools police chief Edwin Lopez said.
Earlier, officials revealed that Carvalho had never signed a $15.3 million contract with the online platform at the center of the crisis.
Ron Steiger, the Miami-Dade County school district's chief financial officer, made the announcement Wednesday during a school board meeting to discuss the failures of K12's online platform, My School Online, the Miami Herald reported.
And the district could only measure one-time log-ins, not sustained participation, which is a feature offered by My School Online.