EXCLUSIVE – The FBI and CDC are investigating an attack on a federal air marshal who was injected with a syringe full of an unknown substance inside the Lagos, Nigeria airport on Sunday, according to a Situational Awareness notice obtained by FoxNews.com. A federal air marshal reported being attacked by a subject while on the public side of the Lagos Airport on Sunday, according to an alert from TSA's Transportation Security Operations Center distributed throughout the agency on Monday afternoon. It appeared to be an isolated incident, the alert says. "The [air marshal] reported that the subject stuck him with...