More than two weeks after militants killed a U.S. ambassador and three other Americans at a diplomatic mission in Libya, FBI investigators have not gone into the city where the attack took place due to security concerns, a federal law enforcement official said today, even if such concerns haven't stopped journalists from operating freely in the same city.

Read more http://feeds.abcnews.com/click.phdo?i=116a1ca2f6ca3f896e8ae42155d2ea1e