On the same day Colombia said it had captured a Venezuelan national guard officer carrying 40,000 AK-47 assault rifle cartridges believed to be intended for leftist guerrillas, President Hugo Chávez of Venezuela said Saturday he would withdraw a decree overhauling intelligence policies that he had made earlier that week. The rare reversal by Mr. Chávez came amid intensifying criticism in Venezuela from human rights groups. The capture of the Venezuelan officer in eastern Colombia could reignite tensions between the neighboring countries over Venezuela’s support for the rebel group FARC. Colombia’s attorney general, Mario Iguarán, said Saturday that security forces had...