What did the Spanish do in response of La Salle's activities in Texas?

When the Spanish authorities received information about La Salle’s from a French deserter and from Native Americans, they were very concerned that the creation of a French settlement on the coast of Texas might become a launching point for attacks on Spanish outposts and silver mines.
Spain sent several expeditions to try to locate the French settlement. When they finally succeeded in April, 1689, they found the fort was empty and destroyed. By this time, La Salle himself had died. Native Americans of the Karankawa nation had attacked the fort a few months previously and killed the remaining adult settlers; they spared only four children. The Spanish destroyed all traces of the French settlement and buried the French cannons. They continued to feel threatened by the possibility of more French explorations, and so increased the tempo of their own explorations and settlement in Texas.