Italian Foreign Minister Paolo Gentiloni said it was hard to speculate who was behind the abductions.
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The ministry in a statement Monday said the four were employees of the Bonatti construction company.
Some, like 10 Tunisian diplomats seized by gunmen from government-linked militias last month, were freed after demands were met. Last month, an Italian doctor kidnapped in January was also freed.
However, many Italians work in oil, gas and construction sectors in Libya, which was an Italian colony in the early 1900s.
The ministry said a crisis unit was “in constant contact” with the families and Bonatti, the company that employs the four.
Italian embassy in Libya has been closed since February 15 this year and the Italian ministry has urged its people to leave the North African nation because of the dangers to other country nationls in the country.
After being plunged into chaos following the overthrow of dictator Muammar Gaddafi in 2011, Libya has two governments conflicting over power as well as armed groups fighting for control of the country’s oil wealth.
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Nine foreign oil workers were kidnapped by IS.
