The Indian men, who have been in Libya for more than a year and were working at Sirte University, were detained at a checkpoint about 50 km (30 miles) outside Sirte late on Wednesday while on their way back to India, Ministry of External Affairs spokesman Vikas Swarup said in a statement.

The government said the men had been taken back to Sirte.

Swarup did not comment on what group or individuals the Indian government believed were behind the detention of the men.

"We are in regular touch with the families concerned and all efforts are being made to ensure the well-being and early release of the four Indian nationals," Swarup said.

Various militias and Islamist factions have been battling in Libya since former strongman Muammar Gaddafi was overthrown and killed in 2011.

Separately, in Iraq, a group of 39 Indian construction workers have been held captive by the Islamic State in Mosul for more than a year, despite attempts by the Indian government to secure their release.

"Numerous third-party sources have told us they were alive," Swarup told Reuters.

--reuters--