In a letter to the European Commission dated May 11, which AFP obtained a copy today, ministers Thomas de Maiziere and Marco Minniti said they "are convinced that we all must do more" to "prevent that hundreds of thousands of people once again risk their lives in Libya and on the Mediterranean Sea in the hands of smugglers."
Italy had already registered nearly 42,500 migrants coming by sea by mid-April this year and 97 percent of them arrived from Libya, the letter said.
To close the migrant route from Niger to Libya, the ministers are seeking "support for growth and development programmes in local communities" along the border.
Other measures include "technical and financial support" for Libyan authorities fighting illegal migration, particularly at the border with Niger.
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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.
According to the Libyan government, between 7,000 and 8,000 migrants mostly from sub-Saharan Africa are being held in Libyan detention centres after entering the country illegally.