Human remains sent to two Vancouver schools came from Montreal accompanied by a note, police say, linking them to a Canadian porn actor held over the murder and dismemberment of his lover.
Luka Rocco Magnotta, 29, is suspected of killing Chinese student Jun Lin, 33, in Montreal, and posting severed body parts to political parties in Canada.
Mr Magnotta was arrested on Monday and has appeared in a Berlin court.
The two schools have now reopened, a day after receiving the remains.
The packages contained what appeared to be a human hand and foot, and are thought to be limbs missing from Mr Lin's body.
"They were the same limbs we were looking for," Police Commander Ian Lafreniere said. Mr Lin's head is still missing.
On Wednesday, Montreal police also said some of the packages contained notes, including one of the Vancouver packages.
Mr Lafreniere also said one note was found in the parcel that arrived at the Conservative Party headquarters, but did not provide details of what the note said.
The police did not want to encourage copy-cats, Mr Lafreniere added.
On Tuesday, Canadian police said a package with what appeared to be a human hand was opened at Vancouver's False Creek Elementary School.
Another parcel with what looked like a human foot was found at St George's school for boys in the western Canadian city.
Mr Lin's other hand and foot were discovered last week after they were posted to Canada's political parties.
Both schools reopened on Wednesday after being temporarily closed for forensic examination.
The hunt for Mr Lin's killer spread out of Canada and eventually saw police pick up the trail of Mr Magnotta in Europe.
Police say he flew from Montreal to Paris on 26 May, eventually travelling by coach from France to Germany.
Mr Magnotta was picked up in a cybercafe in Berlin's Neukoelln district, where he had reportedly been reading articles about himself.
He was arrested on Monday without a struggle and is not said to be planning to fight his extradition to Canada.
According to reports, the suspect had reportedly worked as a bisexual porn actor and model.
His lover, Mr Lin, who was from the city of Wuhan in China, had been enrolled as an undergraduate to study engineering and computer science at Concordia University in Montreal.
Mr Lin's family have arrived in Montreal from China and are due to meet police shortly.
Investigators say a video posted online, in which a man apparently uses an ice pick to kill another man, is believed to show Mr Lin's murder.
Mr Magnotta faces charges in Canada of murder and threatening Canadian politicians.