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A teen killer has been captured in CCTV footage stalking his victim through a college before he stabbed him to death.
The images show Laoui Ali, 17, calmly riding the bus from his Birmingham home to Joseph Chamberlain College in the city.
The teenager is captured on film hanging around outside the college gates with his hands in his pockets, as he waits, armed with a concealed knife, for his 16-year-old victim, Sidali Mohamed.
Ali is captured putting on a mask, walking across a green, then standing at one side as streams of students file past following a day of lessons, reports Birmingham Live .