At least seven boats have caught fire at a shipyard in the port of Bushehr in southern Iran.

According to the head of the local crisis management organization, the blaze had been contained and that no casualties had been reported. The cause was not clear, but it is the latest in a series of mysterious incidents in Iran in recent weeks.

They have included explosions and fires at a missile facility, a power plant, a medical clinic and a nuclear complex. The incidents have led to speculation about a campaign of sabotage.