As investigators continue to examine whether there were missed signals in the Fort Hood shooting massacre, some individuals are frustrated that there are still gaps in information-sharing, especially when it comes to looking at federal gun laws.
The Fort Hood shooting followed a June incident in Little Rock, Ark., where police say Abdulhakim Mujahid Muhammad opened fire at an Army recruiting station, killing a soldier. Muhammad was under FBI investigation for possible ties to terror and travel to Yemen.
A senior law enforcement official tells ABC News that Muhammad purchased a gun in the weeks before the shooting at a department store. An FBI background check was done -- but the FBI counterterrorism investigators working Muhammad's case were apparently unaware.
Senior law enforcement officials say the Brady Law forbids them from widely sharing information about legal gun purchases.
"We need to be smarter about sharing information," said former 9/11 commissioner Richard Ben-Veniste. "It's very disturbing to see…that the FBI is precluded from sharing information."
Current federal law does not prohibit people on the terrorist watch lists from purchasing guns unless there is a prohibiting factor, such as being a fugitive, having a felony conviction or charge, renouncing U.S. citizenship or having been determined as mentally impaired.
Earlier this year, Sen. Frank R. Lautenberg, D-N.J., introduced legislation which would prevent known or suspected terror suspects from purchasing firearms.
"If someone on any terrorist watch list tries to buy a weapon, law enforcement must be informed – period," Lautenberg said in a statement Wednesday when contacted by ABC News. "If some people are being blocked from flying on an airplane, then we should certainly know when they are buying an assault weapon."
The FBI unit responsible for background checks on gun purchases does provide leads to the FBI about some high priority terrorism suspects; but that watch list is not inclusive of everyone the government may have concerns about.
FBI Director Robert S. Mueller III, at a June 4, 2009, Senate appropriations hearing, said on the issue, "We are notified when there is a -- appears to be a purchase of somebody who is affiliated with a terrorist group. But that is different than barring that individual from the outset from purchasing a weapon. But again, I have to defer to the Department of Justice in terms of the policy position that it is going to take on that issue."
In a statement, NRA spokesman Andrew Arulanandam said, "It isn't surprising that, while the investigation is still ongoing and before all the facts are known, Sen. Lautenberg and the gun control lobby have rushed to exploit this sorrowful event."