The militant group that Ojeda Rios led, Los Macheteros, issued a statement Tuesday saying they would avenge his death. The killing has outraged Puerto Ricans of all political stripes especially because it occurred on Sept. 23 — the anniversary of an 1868 uprising against Spanish rule. Congressman Jose Serrano of New York said he is concerned that this is the beginning of a new government crackdown on the Puerto Rican independence movement. On Monday, FBI Director Robert Mueller responded to increasing criticism by announcing an independent investigation into the shooting.