Danish analyst Tore Hamming points out that IS's advances against Libyan oil refineries will have "critical implications for Libya's future oil export."
But as Libyan analyst Mohamed Eljarh notes, both of Libya's main oil terminals -- al-Sidra and Ras Lanuf have been closed for more than a year with no exports, even though Libyan employees are still working at both sites.
The English-language news site Libya's Channel is reporting that IS is attacking Libya's Oil Crescent, which includes the two oil refinery ports of al-Sidra and Ras Lanuf, from three sides.
The Libyan air force has hit an IS convoy close to the al-Sidra oil refinery port, Libya's Channel is reporting.
The English-language Libya's Channel says that IS has named its operation to take over the Libyan town of Bin Jawad after Abu Mughira al-Qahtani, who was named leader of IS in Libya in September.
The Libya Observer is reporting that the Libyan oil port of al-Sidra, which came under attack from IS militants today, is still under the control of a federalist armed group under the command of Libyan militia leader Ibrahim Jadhran.
Jadhran's Ajdabiya-based Petroleum Facilities Guard (PFG) has controlled the Gulf of Sirte terminals since late 2011, according to Jane's Intelligence Weekly.
Reuters has more on this morning's attack by the IS group on the Libyan oil port of al-Sidra and the clashes between Ibrahim Jadhran's forces and IS militants near the town.
Islamic State militants on Monday clashed with a force guarding Libya's [Sidra] oil port, and fighting continued near the major export terminal, witnesses and troops said.
No official was available to confirm the attack or details of how close the fighting was to the port. But Islamic State tried to attack [Sidra] once before in October last year, setting of a car bomb and raiding a perimeter gate.
The current situation in Libya's oil crescent, where IS is clashing with local militias around the oil port of Sidra, is unclear -- but local social media accounts in Sirte are reporting that IS militants have overran the site of the Harouge oil company.
The claims are unconfirmed as yet.
This just tweeted by Libya's Channel regarding casualties following IS's attack this morning at the Sidra oil port. These figures have not been officially confirmed.
Social media accounts in Libya are reporting a fire in a storage unit at the Harouge crude storage tanks amid clashes between the IS group and local militias in the oil port of Sidra.
There are also unconfirmed reports, again by local social media accounts, that an IS suicide bomber blew himself up at the Sidra oil terminal.