Madrid- Spanish police have seized some 500,000 falsified products, with an estimated market value of 20 million euros (31 million dollars) in their biggest operation against industrial piracy so far, police said Thursday.

The Chinese-made products included shirts, trousers, bags, belts, watches and sunglasses imitating well-known brands. They were found in seven containers which had arrived in the ports of Valencia and Barcelona.

Four people, including an Indian citizen, were held.

Meanwhile in the southern port of Algeciras, police seized more than 100,000 fake brand products worth an estimated 6 million euros. The products were inside three containers coming from China and Indonesia. (dpa)