A suicide car bomb exploded at the entranceway of the facility, located in the Baghdad suburb of Taji, on Sunday, allowing another vehicle carrying at least six other attackers with explosive vests to enter the compound, where they clashed with security forces, police sources told the Reuters news agency.

Three of the facility's gas storage centers were set alight amid the violence before security officials were able to bring the situation under control, a spokesperson for Baghdad Operations Command said.

Flames and black smoke could be seen coming from inside the gas complex following the explosion, a factory employee who lives near to the facility told Reuters.

Police and army personnel rushed to the factory, where gunfire could be heard for about an hour, the unnamed worker added.

There has been no immediate claim of responsibility for the attack, but "Islamic State" (IS) militants, who control large areas of the country's north and west, have conducted similar bombings this week that left around 100 dead.

Iraq's Prime Minister Haider al-Abadi said Saturday that militants had taken advantage of the country's political crisis, sparked by his attempt to change its quota-based governing system.

A US-led coalition backing the Iraqi government in its fight against IS has been training army forces for months at a military base located in Taji.

jlw/tj (Reuters, AP)