(CBS) — The husband and wife who gunned down two Las Vegas police officers and a shopper at a Las Vegas strip mall on Sunday lived in Lafayette, Indiana, before moving to Nevada in January.

Investigators in Las Vegas have been examining a series of YouTube videos and other social media posts by the couple as they try to figure out what sparked their shooting rampage.

In one YouTube video, Jerad Miller claimed police can’t be trusted.

“What better way to kill and rape, after all, if you’re wearing a badge,” he said. “When law enforcement and government are the criminals, they will fear an armed and educated people.”

While living in Lafayette, Jerad and his wife Amanda took part in last November’s “Million Mask March” – a gathering of protesters from the Occupy movement, anarchists, and hacktivists.

Nick Wertz, one of the organizers of the Lafayette march, said it attracted many people upset over a lot of issues.

“Everyone there just seem kind of like normal people. At least they were going to stick up with what they thought was right,” he said.