CHICAGO — Federal prosecutors moved Thursday to dismiss charges against a woman who was shot several times by a Border Patrol agent last month during the federal immigration crackdown in the Chicago area.

Prosecutors had accused Marimar Martinez, 30, and Anthony Ruiz, 21, of using their vehicles to strike and box in Border Patrol agent Charles Exum’s SUV on Oct. 4 on Chicago’s southwest side. Mr. Exum then exited his car and opened fire on Ms. Martinez, who suffered seven gunshot wounds.

Hours before a status hearing, prosecutors filed a motion to dismiss the charges against the two defendants, marking a dramatic reversal in one of the most closely watched cases tied to the crackdown in and around the country’s third-largest city.

In a statement sent to The Associated Press, Ms. Martine

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