Photo: Marie D. De Jesús, Staff Photographer Photo: Marie D. De Jesús, Staff Photographer Photo: Marie D. De Jesús, Staff Photographer Photo: Yi-Chin Lee, Houston Chronicle / Houston Chronicle Photo: Hannah Dellinger

FBI agents are conducting an investigation at the HISD administrative offices, but what they are looking for is unclear.

The FBI sent out a news release Thursday morning, describing their presence at the Hattie Mae White Educational Support Center in northwest Houston as "conducting court authorized law enforcement activity." They would not elaborate.

At least a dozen federal authorities were seen at the building at 4400 West 18th Street. At least six unmarked vehicles were parked nearby.

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Thursday afternoon, a federal agent was seen loading what appeared to be a black trunk into a vehicle. Earlier, media outlets reported that authorities were seen carrying out white boxes from the building.

Authorities are also at the Cypress area home of an HISD administrator.

Sonia Gonzalez, an attorney with the Houston Federation of Teachers, said she went to the administration building when she heard of the activity. She said she saw one person from the IRS working with the FBI.

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“Anytime something happens in the district, it affects our teachers, so of course it worries us,” she said.

The FBI sent out the following news release Thursday morning:

The FBI is conducting court authorized law enforcement activity at the Hattie Mae White, HISD Administration Building. We want to assure the public there is no danger to the HISD students, staff or greater Houston community. We will provide any additional information once it becomes public. We have no further comment at this time.

HISD released the following statement in response to the investigation:

HISD can confirm that the FBI is in the Hattie Mae White Educational Support Center this morning regarding a court authorized law enforcement matter. The district is fully cooperating. There is no danger to students, staff or the community.

This is a developing story. Check back for updates.

Danny Hermosillo is the Sr. Digital News Editor for Chron.com | Read him on our breaking news site, Chron.com, and our subscriber site, HoustonChronicle.com | Follow him on Twitter at @Dannyherm1| Email him at Danny.Hermosillo@chron.com