Scientists say they have begun tagging thousands of sharks off Mexico's Pacific Coast in the hopes of preventing new attacks on humans.

Shark expert Leonardo Castillo says scientists will attach transmitters to two sharks and track them by satellite.

Castillo said 15 other sharks will get sonar transmitters and 2,000 more will get plastic tags that can be tracked by fishermen.

Sharks recently killed two surfers and wounded a third near the southwestern resort of Ixtapa-Zihuatanejo, about 240 miles north of Acapulco.