Abdulrazaq al-Shniti, from the authority to counter illegal immigration, spoke at the opening of a new detention centre in Tajoura, an eastern suburb of the capital Tripoli.
The new centre brings the total number of operational migrant detention centres in the country to 23, he said.
It already shelters 130 young African migrants, an official there said, after they were detained this week from a nearby warehouse where people smugglers had kept them before a planned sea crossing to Europe.
He said illegal immigration into Libya took place because its southern borders were "completely open".
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"If we can stop (migrants crossing) into the southern region, we will be able to limit illegal immigration," Shniti said.
Libya has long struggled to control its 5,000 kilometres of southern borders with Sudan, Chad and Niger, even before the 2011 uprising that toppled dictator Moamer Kadhafi.
The North African country has long been a stepping stone for migrants seeking to cross the Mediterranean for a better life in Europe.
In 2016, a record 1,81,000 migrants reached Italy, 90 per cent of them from Libya.
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