New video footage shows the suspect in last week's mass shooting at a Minneapolis Catholic school buying a firearm at a gun shop just days before the attack.

The video footage, obtained by ABC Minneapolis affiliate KSTP , shows 23-year-old Robin Westman inside Frontiersman Sports for about 40 minutes on Aug. 23 -- just days before the shooting attack at the Annunciation School -- buying a .38 special revolver, according to the station.

That gun was not one of the three that police have said were used in the shooting rampage, according to the store owner, KSTP reported.

In the new video, Westman, with hair pulled back in a ponytail and wearing a T-shirt, is seen browsing the firearms and, at one point, even hoisting a rifle and aiming it.

The gun shop owner, Kory Krause, told KSTP h

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