FOX News has obtained exclusive photos of a truck convoy taking relief supplies from the Dominican Republic into Haiti. (Photos are below.)

Each day a convoy, escorted by U.S. Immigration and Customs Enforcement agents and State Department officials, brings food and other supplies to the Haitian capital of Port au Prince – driving along what one official describes as “the only land route supply line into the country.”

It’s a 16-hour trek to Port au Prince and back. To get there, the convoy must pass through the Jimani port of entry at the Dominican Republic-Haiti border.

“Getting those convoys in is a big deal,” said one U.S. official. “You can only land so much with planes [at the airport], and you’ve got tens of thousands or more who are sick and in need.”

ICE, whose stated mission is to enforce U.S. immigration and customs laws, has “useful service and expertise” it can offer a major relief effort, according to ICE spokesman Brian Hale.

“We want to help,” Hale said. “Immediately after the earthquake, ICE was able to respond by putting a team on the ground in the Dominican Republic to provide logistical support for much needed supply convoys driving fuel and other material into Haiti.”

Hale said ICE’s “years of fostering positive international relationships” proved “critical” to helping Haitians after the devastating earthquake.

“As an agency with a strong international presence, we were able to draw upon our years of experience within the Caribbean region and leverage our relationships with partner nations to get on scene and start working right away to help the citizens of Haiti.”