This is why:
NYPD detectives tracing sales of the kind of gun used to kill the UnitedHealthcare CEO arrived at a shop in Connecticut on Thursday that sold the same type of gun, according to police sources.
Police believe the shooter used a B&T Station Six, known in Britain as
a Welrod pistol.
The gun does not have a silencer but rather a long barrel that enables the 9mm to fire a nearly silent shot.
It requires manually cycling ammunition from the magazine, which is consistent with what is seen in the video of the shooting.
The weapon is not easily attainable so investigators have been running down all recent purchases.
The actual gun used in the shooting of Thompson has not been recovered so this is one investigative lead authorities are following.
Law enforcement sources told ABC News that the suspect went through Port Authority Bus Terminal and detectives have been looking to see if they can spot him on video.
abc7ny.com