Authorities shattered windows and used a blowtorch during an early Saturday raid of a Riverside, California home that officials are investigating in connection to the San Bernardino mass shooting earlier this week

While the FBI has not divulged what it was looking for during the search, the person who bought two assault rifles used in the Wednesday shooting lives in the home, a law enforcement official who spoke on the condition of anonymity told the Associated Press. The shooting is being investigated as a terrorist act, and would be the worst such assault on U.S. soil since 9/11.

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