Mexico has refused a request from President Donald Trump’s administration to allow a U.S. military aircraft deporting migrants to land in the country, a U.S. official and a Mexican official told Reuters.

U.S. military aircraft carried out two similar flights, each with about 80 migrants, to Guatemala on Friday. The government was not able to move ahead with a plan to have a C-17 transport aircraft land in Mexico, however, after the country denied permission.

The Mexican official did not give a reason for the denial of permission to land, while the foreign ministry did not mention the incident.