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Lopez said his department training taught him that suspects with knives can pose a threat even when they are several feet away.

"He wouldn't have been able to deal drugs. He wouldn't have been able to carry knives. He'd get educated," he said.

Several purchases of knives had also been made online, and officers found knives, latex gloves and a balaclava at his home in Purley.

The criminology student at the University of Greenwich had collected knives and researched locations to carry out the killing, the court was told.

It was also discovered that Saadi, a criminology student at the University of Greenwich, had an interest in true crime and had bought multiple knives online.