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Federal agents are trying to determine how a suspected Ohio white supremacist with a felony conviction for manslaughter acquired a cache of 18 assault weapons and other firearms, along with high-capacity magazines and more than 40,000 rounds of ammunition, according to federal law enforcement officials and court documents reviewed by NBC News.

[..]

The law enforcement officials said the case appears to illustrate some of the gaps in current background checks for gun purchasers that President Barack Obama has proposed closing as part of his package of executive actions and legislative proposals released this week aimed at curbing gun violence.