HOUSTON — As classes began at many of the district’s schools Thursday morning, FBI and other agents got to work at Houston ISD headquarters.

"We got here pretty early, I think," said FBI Houston spokesperson C.J. Jones. "A little after 8 (a.m.).”

All Jones would say is that agents conducted a so-called “court authorized law enforcement activity.”

"We will be here for a while until they’re done with what they need to do," Jones said. "And that’s really all we can share at this time.”

The building is located at 4400 W 18th in northwest Houston.

Agents came out of the building with multiple boxes, at least one computer and other materials.

Meanwhile, agents also visited the home of HISD chief operating officer Brian Busby.

There was no confirmation the two scenes were connected. However, that's what many people assumed.

"We’ve just been making sure that any of our members who may be affected by this are aware of the resources that the union provides for them,” said Sonia Gonzalez of the Houston Federation of Teachers Union.

Business continued at district headquarters amid the activity.

HISD issued a brief statement saying that it was cooperating and that there was no danger to students, staff or the community.

"My advice to parents is that things are going as normal," Gonzalez said. "Teachers are reporting to work, they’re going to do their job, and their kids are going to be served properly.”

The FBI would not say if a specific department was the subject of the search or if any arrests were made.

"And there’s not any other information we can share at this time," Jones said. "But we will share more when it’s made publicly available.”

We also reached out to the Texas Education Agency, which is set to take over HISD due to alleged mismanagement and student achievement issues.

It had no comment regarding the FBI activity.

RELATED: HISD administrators remain suspended after video of teachers dressed in provocative outfits dancing for dollars

RELATED: HISD removes employee from elementary school after allegations of inappropriate conduct

RELATED: HISD swears in its first all-female school board

RELATED: Teachers, students, parents rally after state takeover of HISD temporarily blocked

RELATED: Federal judge dismisses Houston ISD lawsuit seeking to avoid state takeover