The first incident occurred Friday in La Grulla, where agents responding to a suspicious activity call encountered 10 migrants, including three children.
Early Sunday, agents working in Garceno detected fresh footprints leading away from the river and into the United States, prompting the deployment of a K-9 that led investigators to four bundles of marijuana.
Sunday evening, Rio Grande City agents working with CPB air assistance in La Grulla observed three people carrying bundles, who retreated back to Mexico but abandoned their cargo.
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