"An Army veteran who sped away from MacDill Air Force Base security on a motorcycle was fatally shot Wednesday by an FBI agent after the man threatened him with a knife, officials said. At about 6 p.m., base security was called to an altercation, which wasn't described, at a camping area inside the base, said Col. Larry Martin, the base commander. The veteran who was described as a guest at the camping area was arguing with another person, but officials wouldn't name either. ""We don't have a lot of details about what went on in that altercation,"" Martin said. The veteran sped away on his motorcycle and security tried to stop him, Martin said. He evaded authorities and drove to the Dale Mabry Gate, one of the main entrances and exits to the base. Law enforcement tried to stop him and the man got off his motorcycle. He came ""directly at"" the agent with a knife, said FBI special agent Dave Couvertier. The agent shot more than once, killing the veteran, Couvertier said."