Mexican officials have captured more than 200 migrants hidden in trucks over the past two days, including dozens spotted by a large X-ray scanner huddled in secret compartments, as the country steps up a crackdown under U.S. pressure.

Footage of the X-ray shows a ghost-like truck filled with the brightened silhouettes of the migrants — some sitting and others lying down — along two levels of the crowded compartments on Sunday.

An additional 228 hidden migrants were found in a routine search of a soft drink transportation truck in the southern state of Chiapas on Monday, Mexico's security ministry said in a statement.