(CNN) United States Customs and Border Protection on Friday released a slightly different account of a border agent's fatal shooting of an undocumented migrant near Laredo, Texas, raising new questions about what actually happened.

After initially reporting the agent was attacked by migrants armed with "blunt objects," the federal agency on Friday said only that the group "rushed" the officer after ignoring orders to get on the ground.

But its latest version of events makes no mention of blunt objects described in an agency statement issued after Wednesday's shooting in the border town of Rio Bravo.

Additionally, the Border Patrol at first reported that a round from the officer's gun "fatally wounded one of the assailants" but the latest statement refers to the gunshot victim as a "member of the group."

Customs and Border Protection on Friday canceled a new conference on the shooting and instead released its updated statement.

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