You'll have to make your scenario more specific. Are they in the process of assembling an IND or have they already assembled it? Have they threatened anyone? How many of them are there? Where, exactly, are they located? What evidence do we have against them? Who has seen and reviewed this evidence? Is it credible? Are there other people with or near the suspects who might be harmed in a drone attack? Have attempts already been made to apprehend the suspects?