Mattel Inc. announced its third recall of toys made in China Wednesday, saying more than 800,000 could possibly be contaminated.

The El Segundo-based toymaker is recalling 675,000 accessories and other types from the Barbie line as well as 90,000 GeoTrax locomotives and about 8,900 Big Big World 6-in-1 Bongo Band toys, both from the company’s Fisher-Price brand.

In a statement issued late Tuesday, Robert Eckert, Mattel’s chairman and chief executive said: “As a result of our ongoing investigation, we discovered additional affected products. Consequently, several subcontractors are no longer manufacturing Mattel toys. We apologize again to everyone affected and promise that we will continue to focus on ensuring the safety and quality of our toys.”

Mattel added that it has completed its testing program for the majority of its toys and spent some 50,000 hours investigating vendors and testing toys since the first recall was announced.

The toymaker made its first recall of on Aug. 1, saying that 1.5 million Fisher Price preschool toys, featuring Dora the Explorer, Elmo and Big Bird could contain high levels of lead paint. Two weeks later Mattel announced a recall of about 19 million more toys because of threat by lead paint or small magnets that could be swallowed by children.

Mattel manufactures about 65 percent of its toys in China and about 50 percent of those are produced in company-owned plants. The problems leading to the recalls have mostly been associated with Mattel’s subcontractors, Eckert said.

The toy maker is trying to tighten the reigns on its Chinese manufacturers, requiring them to test toys before they are sent to stores, and increasing unannounced random testing and enforcement of its suppliers there.

Shares in Mattel dropped 2.7 percent, or 60 cents per share, to $21.37 in early morning trading Wednesday on the New York Stock Exchange.