NEW DELHI (AP) — Police say a blast triggered by a suspected gas leak in a ship being dismantled in western India has killed five workers and injured another seven.

Police officer Ramesh Budhrejiya says the explosion occurred in a chemical tank on Saturday while the workers were dismantling the old vessel at the Alang ship-breaking yard in Gujarat state.

The blast was believed to have been caused by a sudden gas leakage which also started a fire, the Press Trust of India quoted police officer K. J. Rathod as saying.

The ship-breaking yard is nearly 1,100 kilometers (685 miles) west of New Delhi.

India has one of the world’s largest industries for breaking down old ships and oil tankers, but like most countries it does not accept ships with toxic materials.