A South Florida man already behind bars for a double murder is now facing a new round of charges after authorities discovered more than 70 pipe bombs at his Homestead home, officials said.

Investigators said the explosives were discovered in August when Paul Koch's son found several boxes filled with pipe bombs inside their home.

The discovery prompted an immediate response from multiple agencies, including the Miami-Dade Sheriff's Office, the bomb squad, the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) and Homeland Security.

Already jailed for double murder

Koch, who is already in jail awaiting trial for two counts of second-degree murder, was accused of shooting two people at a Redland bar in March.

According to court records, Koch had been kicked out of the bar, we

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