Two people accused of plotting to open fire at a Halifax mall have had their case put over until next month.

Lindsay Kanittha Souvannarath, 23, and Randall Steven Shepherd, 20, are both charged with conspiracy to commit murder, conspiracy to commit arson, illegal possession of weapons, and making a threat through social media.

They were arrested Friday at the Halifax Stanfield International Airport, after a tip to Crime Stoppers.

Police allege that they were planning a Valentine's Day attack at the Halifax Shopping Centre. None of the allegations have been proven in court.

When the two appeared briefly in court Tuesday, their cases were adjourned until March 6. Crown lawyer Shauna MacDonald said the two are still seeking legal counsel.

A third suspect, 19-year-old James Gamble, was found dead at his parents' home early Friday.

Here's what is known about the suspects.

Gamble and Shepherd grew up together in Timberlea, N.S. Neighbours confirm that both graduated from Sir John A Macdonald High School. Neither of the men had a job or a criminal record.

Both of them had pages on the micro-blogging platform Tumblr, on which they posted violent images of the Columbine murderers and neo-Nazi symbols.

Before the arrest, Shepherd had been living in Halifax.

A woman who says she rented a room to Shepherd in her family home told CTV Atlantic he moved in last December.

The woman, who does not want to be identified, said Shepherd paid his rent and cooked a lot. She called him “quiet” and “very sweet to talk to.”

She was shocked when police found a large gas canister while searching through Shepherd’s room.

“I was like, ‘Why did you guys bring a gas can into my room?’” the woman recalled saying to police. “And they were like, ‘That was there.’”

She said Shepherd quit his job at a call centre last week.

Police say Souvannarath flew to Nova Scotia from her home in Geneva, Ill. She graduated from Coe College in Iowa in 2014, with a Bachelor of Arts degree in English and creative writing.

A sign posted on her family's Illinois home said that they were not ready to speak with the media.

"We are very sorry, but we are not prepared to make a statement at this time," the sign said.

Police say Souvannarath met Gamble and Shepherd online.

Psychology professor Steve Smith said individuals seeking acceptance often look for others online who share their beliefs.

"What happens is you have a certain set of interests, and then there's other people like you that have the same interests," he told CTV Atlantic. "When you interact with each other, what you tend to do is become more extreme."

Smith said that while online forums where members discuss violence are not uncommon, there are very few people, even within those groups, who are willing to commit a violent act.

"We have lots of people that have lots of extreme views, but they're not harmful to anybody or even themselves," he said. "I think when it's harm to yourself or others, that's when there's risk. And when there's risk, that's when there's a problem."

With a report from CTV Atlantic's Kelland Sundahl