Federal agents around the country were told in recent days that the F.B.I. would no longer investigate confrontations with immigration agents — cases that sometimes yield evidence that could be used to prosecute Department of Homeland Security agents implicated in violent encounters, according to people briefed on the decision.
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F.B.I. managers around the country received a written notice informing them of the change on Thursday, according to the people familiar with the matter who spoke on the condition of anonymity to describe internal communications. The same day, some ICE agents around the country were notified by their F.B.I. counterparts.
The guidance shared with them said that the bureau would stop investigating claims of assaults against Department of Homeland Security agents, the people said. Even though such investigations are intended to determine whether the officers were in fact attacked, they can provide a crucial means of gathering evidence implicating the agents themselves.
A joint statement by the Justice Department and the Department of Homeland Security, however, denied that any such change was underway.
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Under the change, responsibility for investigating cases involving federal immigration officers would likely fall to Homeland Security Investigations, an arm of ICE, effectively leaving the agency to investigate itself, according to guidance circulated among F.B.I. and ICE agents.
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