Stabber was turned in by his mum after he killed this teenager

A ‘school beef’ killer dumped a 10 inch Rambo knife in a park after murdering another teenager on a bus then went to meet his social worker as if nothing had happened, a court heard. The 16-year-old, who cannot be named, knifed Baptista Adjei, 15, in the heart and stabbed another boy in the thigh and elbow after their school rivalries boiled over in a Snapchat row. Another teenager tipped him off that Baptista would be on the 241 bus…