Updated 9.15pm -

Fourteen Tunisian oil workers kidnapped in Libya were freed Sunday night after three days in captivity and are in good health, the Tunisian consul in Libya said.

The consul, Taoufik al-Guesmi, did not disclose the conditions for the release of the workers, whose abductors had demanded a man jailed in Tunisia for drug trafficking be released from prison.  

The 14 Tunisians were abducted on Thursday in Zawiya, a town just west of the Libyan capital Tripoli, as they were heading to work by bus in an oil refinery.

The bus driver was also kidnapped but then released, a security source in the town said. 

Zawiya is held by armed groups, including some who are involved in people-smuggling rings or the contraband sale of fuel.

Abductions are common in Libya, which has been mired in chaos since the fall of dictator Moamer Kadhafi in a 2011 NATO-backed uprising.

The kidnappings are usually carried out by armed groups which demand a ransom.

In June 2015, 10 Tunisian consular staff were abducted by a militia. They were eventually released in exchange for one of its members who was held in Tunis.