A friend of the Florida high school shooting suspect said in an interview on Tuesday that she noticed disturbing traits in Nikolas Cruz prior to last week's shooting. 

"He talked about killing our parents, our friends, boyfriends, and girlfriends," Ariana Lopez said on ABC's "Good Morning America."

Lopez said that while her friendship with Cruz started out normally,  she soon noticed he would often display weapons and post disturbing pictures online. 

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"He used to sell knives out of his lunchbox, which I thought was insane because this is a school. He's like, 'hey guys, want some knives?'" she said. 

"He would talk about how he sympathized with Syrian terrorists, and how those who opposed him should be killed. He posted pictures of 15 or more firearms just on his bed," she added. 

Cruz allegedly killed 17 people and injured numerous others at Marjory Stoneman Douglas High School in Parkland, Fla., last Wednesday. 

The couple who took Cruz into their home last November said they did not notice any red flags prior to the shooting. 

"Everything everyone seems to know we didn't know. We had rules and he followed every rule to the T," James Snead said on ABC's "Good Morning America" on Monday. 

"Nothing like they portray on television, or in the media, or in newspapers," Snead's wife, Kimberly Snead, said.

The shooting has galvanized survivors and students to take action on the issue of gun violence in the U.S.

Students from Parkland will travel to Florida's capital of Tallahassee on Wednesday to speak with state lawmakers about the issue.