Two people were arrested at Halifax Stanfield International Airport and have been charged with conspiracy to commit murder after an alleged plot was foiled to kill a large number of people at the Halifax Shopping Centre in the city’s west end on Valentine’s Day.
Lindsay Kanittha Souvannarath, a 23-year-old from Geneva, Ill., and Randall Steven Shepherd, 20, of Halifax have been charged.
A 17-year-old male from Cole Harbour, N.S., was originally arrested, but has since been released without charges.

Police say there is no evidence to link the teen to the charges against Souvannarath and Shepherd, but the investigation is ongoing.

Police tracked down a 19-year-old to a home on Friday on Tiger Maple Drive in Timberlea, about 20 minutes outside Halifax. Authorities initially thought he may have been linked to the alleged plot. He was found dead early Friday, and his death is under investigation by Nova Scotia’s Serious Incident Response Team.

Officers seized three long-barreled rifles from the Timberlea home.

Souvannarath was arrested at the Halifax Stanfield International Airport after arriving in Canada early Friday, at around 2 a.m. Shepherd, who was there to meet her, was also arrested.

Brian Brennan, Nova Scotia RCMP commanding officer, said a Crime Stoppers tip from Canada helped them foil the alleged plot, but wouldn’t provide more information about where they got the information.

Mayor Mike Savage said Halifax police, RCMP, the Geneva Police Department in Illinois, the Canada Border Services Agency and the U.S. Department of Homeland Security were all involved in the operation.

Savage said people may see increased security at events Saturday, comparing it to the heightened security on Remembrance Day after the deaths in separate incidents and on different days of Cpl. Nathan Cirillo and Warrant Officer Patrice Vincent.