The shipment is the first in an operation that U.S. military officials anticipate could scale up to 150 truckloads a day entering the Gaza Strip as Israel presses in on the southern city of Rafah.

Across the city, power lines and trees are downed, traffic lights are out and glass is scattered across downtown. About 900,000 customers were left without power early Friday.

U.S. officials have largely attributed the decline to more enforcement in Mexico, including in yards where migrants are known to board freight trains.