Beijing: China on Monday temporarily averted a major chemical disaster when it blocked breaches to a dike at a chemical plant in its Northeast coast battered by powerful sea waves from an approaching tropical storm.

The dike breached by powerful waves earlier on Monday has been temporarily blocked after workers dumped trucks of rocks and concrete to repair the breach, officials said.

The breach has sparked fears of a toxic spill from a petrochemical plant located behind the dike.

Twenty-meter-high waves, spawned by tropical storm Muifa off the coast of North Liaoning Province, broke a dike in the Jinshan Industrial Zone in the city of Dalian this morning, threatening to hit the Fujia chemical plant just 50 meters behind the dike, a spokesman with the emergency response headquarters said.

The two breaches, which measured at least 20 to 30 meters long each, have been temporarily blocked, but workers still fear that the strong waves might wash away the loosely piled rocks and breach the dike again, he said.

Trucks are still dumping rocks and concrete to make the newly repaired parts solid, said a news agency.

Authorities have not specified which chemicals may be a risk of leaking from the plant.

The Fujia chemical plant is a producer of paraxylene, a petrochemical used to create raw materials for the production of polyester film and fabrics. The chemical is carcinogenic.