As officials scramble to cope with the flood of Haitian migrants to the Del Rio bridge, multiple sources say that the response — including a surge in agents to the bridge from elsewhere in the sector — has left other parts of the border wide open.

As officials scramble to cope with the flood of Haitian migrants to the Del Rio bridge, multiple sources say that the response — including a surge in agents to the bridge from elsewhere in the sector — has left other parts of the border wide open.