The Metropolitan Police Commissioner, Bernard Hogan-Howe, today vowed to stamp racism out of the force.
He told London Tonight that he would be an 'implacable enemy' to racists - and that he would root them out of the force. But he defended the 'vast majority' of his staff as professional and unprejudiced.
The Commissioner admitted that training in one of the most controversial police tactics - stop and search - could be improved, and that the force would focus on that in the coming year.
More top news
"All it takes is for somebody to see me - and I could just die, just like that. I could want to go to the shop and not come home."
Before the killing, Peters searched the internet for "serial killers", "treatment of child killers in prison" and "premeditated murder".
Arriva Rail North, Greater Anglia and South Western Railway are all affected.