OAKLAND — Agents from Homeland Security Investigations served a federal search warrant in West Oakland on Wednesday regarding a human trafficking investigation that involves children, authorities said.

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Man fatally shot at Oakland homeless camp Investigators showed up at a residence in the 700 block of 27th Street around 6:30 a.m. and executed the warrant, said James Schwab, a spokesman for Immigration and Customs Enforcement in San Francisco. HSI is a part of the ICE agency.

“It’s not an immigration enforcement action. This is a criminal investigation, and agents executed a federal search warrant,” Schwab said. “That’s all the information available because it’s still an active and ongoing investigation.”

Two men from Guatemala living in the home were detained by agents. But it was not immediately known if they were detained as part of the trafficking investigation or because of their immigration status.

Besides detaining the two men, agents removed several boxes of possible evidence and other items from the house when they departed about 11:18 a.m. They would not comment.

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Oakland police released a statement around 11:40 a.m., saying the warrant was in connection with human trafficking of children in the city. An earlier report that it involved sex trafficking was incorrect, officials said.

Laura Barrios, 21, who lives in the house with her husband, child and other family members, said after the agents left that she and the others were told the agents were there because something had been brought to their attention about exploitation involving her mother. She added that her mother owned two cleaning businesses, Mendoza’s Janitorial and Prestige Janitorial.

Barrios, who was holding her 1 ½-year-old son as she talked to reporters, said she was asleep and was “really shocked” when the agents came to the house.

She said the agents “at first were aggressive,” but later were “really nice and we were treated respectfully.”

Homeland Security headquarters in San Francisco contacted Oakland police Tuesday and requested two local officers to be used for traffic control, spokeswoman Officer Johnna Watson said. The officers did only that, Watson said, closing two lanes of 27th Street at West Street.

But members of the Alameda County Immigration Legal and Education Partnership who were present at the scene were leery of the coordination.

“We don’t believe in ICE and police partnerships … especially considering Oakland is a sanctuary city,” said Makia Woods, one of the group’s organizers.

Representatives from the organization arrived at the scene around 8 a.m. and were present throughout the afternoon. The group, which has a hotline, arrives at raids and offers families legal and emotional support, especially to those that are detained or possibly deported, she said.

Oakland Police Chief Anne Kirkpatrick gave strict instructions that Oakland officers would not assist HSI with any enforcement efforts, per a City Council action last month that terminated an agreement that allowed local police to take part in ICE task forces.

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Oakland police did not participate in any aspect of the warrant search, according to a statement from Kirkpatrick on Wednesday.