A large fire broke out at a shipyard in the southern Iranian port city of Bushehr on Wednesday, burning seven ships and sending plumes of black smoke billowing above the city skyline, according to videos and Iranian media reports.

The fire followed dozens of recent fires and explosions across Iran’s forests, factories and military and nuclear facilities in the past three months that have rattled ordinary Iranians. Iranian officials have said that some of the episodes may have been acts of sabotage but blamed weather, accidents and equipment malfunctions for the others.

On Tuesday an aluminum factory in the industrial city of Lamard, in Fars Province, caught fire. On Sunday, a fire broke out at petrochemical plant in Khuzestan Province.

Read more: New York Times