Police are investigating a social media threat of the 'biggest mass shooting in modern American history' targeting Walmart stores in Missouri

The threat was posted this week to Reddit by someone claiming to have two AR-15 semi-automatic weapons and 22 pipe bombs.

Police are investigating a social media threat of the 'biggest mass shooting in modern American history' targeting Walmart stores in Missouri

Police are investigating a social media threat of the 'biggest mass shooting in modern American history' targeting Walmart stores in MissouriThe threat was posted this week to Reddit by someone claiming to have two AR-15 semi-automatic weapons and 22 pipe bombs.