Two more bodies were found Thursday near the site where a boat capsized in Lake Titicaca, bringing the confirmed death toll from the accident to 13, Bolivian authorities said.

Area residents discovered the two bodies floating offshore, regional naval commander Pablo Cardona said by telephone from the scene.

Five other people remain unaccounted for after the shipwreck, he said.

The vessel went down about 1 mile from Suriqui island due to excess weight.

At least 27 people were aboard the boat, most of them teachers returning to the mainland after taking part in a school event on Suriqui, Cardona said.

Nine people were rescued safe and sound and the search continues for the missing passengers.

Lake Titicaca, the world’s highest navigable body of water, is shared by Bolivia and Peru.