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Help catch a killer. #catchthesniper. Any information, call Toronto Police Homicide Squad @ 416-808-7400 pic.twitter.com/flEsRnnT2n — Homicide Squad (@TPSHomicide) April 19, 2016

The rifle is a key piece of evidence and was found at a considerable distance from the shooting, though within the crime scene area.

“We were surprised to find it,” Hui said.

The homicide squad would not release details about whether the weapon had any serial numbers on it, but did say that it had a “strong connection” to Montreal.

The homicide has a national focus: not only is the gun linked to Quebec, but police also believe Foo was in St. John’s, Newfoundland in the summer before his murder. Bui said Foo told family he was travelling outside the country in July, though investigators believe he did not leave Canada.

Police also released a photo of a live concert in the George Street and Knight Street area they say is connected to the case.

The investigation may also have international clues. Police say Foo was shot while he was in the middle of a call to someone outside the country.

“For a lack of a better description, this person is an eyewitness to this murder. We would like to speak to them,” Hui said.

Police have run into issues with other individuals linked to the case. The person who discovered Foo’s body a few hours after the shooting has “disappeared” and police are urging them to come forward.

Hui said the murder victim had organized crime connections in the Greater Toronto Area and was the subject of a sweeping gun and gang investigation by Durham Regional Police in 2009. The probe, dubbed ‘Project Isis,’ was a three-year investigation that took $3 million worth of cocaine, heroin, meth and ecstasy off the streets, according to the Toronto Sun. Though Foo was convicted of gun and drug charges in 2011 and sentenced to 12 years in prison, the conviction was overturned on appeal in 2012 and Yoo was set free.

The homicide squad will be releasing more of its evidence periodically over the week.

Anyone with information is asked to contact Toronto Police Homicide Squad at 416-808-7400.