Mali has been hit by a wave of coordinated attacks across the country, with witnesses and officials reporting explosions, gunfire and fighting in several cities at once.

The BBC said the assault spread from the capital, Bamako, to Kati, Gao, Sevare, Mopti and Kidal. The scale of the operation has led analysts to call it the largest coordinated jihadist attack in years.

Two armed actors appear to have been involved. The separatist Azawad Liberation Front, or FLA, said it had worked in coordination with Jama’at Nusrat al-Islam wal-Muslimin, the al-Qaeda-linked group better known as JNIM. That combination of separatist and jihadist action is especially destabilising because it blurs the lines between local rebellion and transnational extremism.

The BBC reported that Mali’s military said some militants had already fled, while another claim from the army said “several hundred” attackers had been killed. The broadcaster said it could not independently verify that casualty figure, and fighting appeared to continue in some areas.

In Kidal, FLA spokesman Mohamed Elmaouloud Ramadane said the group had been preparing the operation for months and was trying to cut the road between Kidal and Tessalit to block army reinforcements. He also said the group aimed eventually to control Gao and then Timbuktu. Those statements are battlefield claims, but they help explain the offensive’s strategic logic.

The consequences have rippled beyond the battlefield. Bamako set checkpoints on roads leading to the airport, imposed a night curfew and temporarily closed the airport. The UK Foreign Office advised against all travel to Mali.

International reaction has been immediate. The African Union Commission chair, the UN secretary-general and the US State Department’s Africa bureau all condemned the violence and expressed solidarity with the Malian people. Those statements are routine in one sense, but they also show how seriously diplomats are treating the size and coordination of the assault.

The background to the crisis is decades old. Mali has been plagued by insurgencies by groups linked to al-Qaeda and the Islamic State group, as well as separatist rebellion in the north. The current military government came to power promising to restore security, but the BBC report makes clear that large parts of the north and east remain outside effective government control.

What makes this episode notable is not just the number of attack sites, but the apparent level of coordination and the open partnership claimed between separatists and jihadists. That combination could make Mali’s security challenge even harder to contain in the coming weeks.