He is reported to have been armed with two weapons, one of them an automatic rifle.

BBC: Norway suspect Anders Behring Breivik 'admits attacks'

In one photo, a smiling William Plotnikov is shown posing in the woods, an automatic rifle slung over his shoulder and a camouflage ammunition belt around his waist.

NPR: Russia Had Elder Boston Suspect Under Surveillance

The 53-year-old actor originally had been sentenced to serve six years in prison on the charge of possessing an automatic rifle and a pistol that were supplied to him by men subsequently convicted in the bombings.

WSJ: Sanjay Dutt Gets Four More Weeks to Surrender

Dutt, 53, originally had been sentenced to serve six years in prison on the charge of possessing an automatic rifle and a pistol that were supplied to him by men subsequently convicted in a series of bombings that hit Mumbai.

NPR: Sanjay Dutt Says He'll Go To Prison As Ordered

Over the past weekend, Defense Distributed successfully 3D-printed and tested an ammunition magazine for an AR semi-automatic rifle, loading and firing 86 rounds from the 30-round clip.

FORBES: Gunsmiths 3D-Print High Capacity Ammo Clips To Thwart Proposed Gun Laws

For example, there's a lot of discussion about should people have the semi-automatic M4, which is an assault rifle that fires single shots, versus a fully automatic one, or couldn't you go up to a heavy one.

NPR: Oversight of Blackwater a 'Grey Zone,' Author Says

The rifle model used by Jacob Tyler Roberts the 22-year-old cited in numerous media reports as the killer was an AR-15 semi-automatic rifle.

FORBES: Type Of Rifle In Oregon Mall Shooting Drives Gun Profits And Youth Interest

So far those pieces have included high capacity ammunition magazines for AR-15s and AK-47s, as well as an AR lower receiver, the body of that semi-automatic rifle to which off-the-shelf components like a stock and barrel can be attached.

FORBES: This Is The World's First Entirely 3D-Printed Gun (Photos)

The attorney general said a search of Spyropoulos' home turned up two semi-automatic handguns, a shotgun and a rifle that police described as an assault weapon.

WSJ: NJ diner manager accused of plotting kin's murder

But Obama seemed to suggest he would support a renewal of an assault weapons ban that would prevent people from buying firearms like the military-style Bushmaster .223 semi-automatic rifle, which gunned down the children in Newtown.

FORBES: President Obama's Speech in Newtown: Leadership At Its Best