Dozens of firefighters are battling a fire in a junk yard in southern Sweden that has sent a thick plume of smoke into the air near the city of Malmo.

The fire started late Thursday in a harbor area outside Malmo, Sweden's third largest city.

Firefighters say plastic and rubber materials are burning forcefully, sending a toxic plume into the sky, but the winds are blowing the smoke toward the Oresund strait, and no residential areas are at risk. There are no reports of injuries.

The cause of the fire wasn't immediately clear. Firefighters on Friday said they expect it will take them several more hours to put it out.