Chavez says Venezuela’s interior minister told him of Friday clash but did not know who the subversives were or what they were doing.It wasn’t clear if the encounter took place in Venezuela or Colombia.Relations between the neighbors have been strained since Colombia raided a rebel camp in Ecuador last March, claiming to find evidence there that Chavez had financed Colombian guerrillas.Chávez used a Saturday speech to urge members of his new socialist party to fight hard in a November vote to win gubernatorial and mayoral seats in areas bordering Colombia.