Mexico refused to accept a US deportation flight on Thursday as President Trump dramatically beefed up security at the border and ordered mass raids and deportations of illegal immigrants throughout the country since he reclaimed the White House, according to military officials.

The flight was blocked from leaving the United States after two Air Force C-17 flights, each carrying about 80 deportees to Guatemala, took off successfully Thursday night, NBC reported.

It was not immediately clear why Mexico blocked the flight.

A White House official told the outlet via text message that “the flights thing was an administrative issue and was quickly rectified.”

This is a developing story. Please check back for updates.