New Delhi, June 5 -- Britain's interior minister accused activists of hijacking a tragedy to stir up violence after police were attacked at a protest over the death of a teenager who was handcuffed as he lay dying while his killer stood nearby.

Police were pelted with chairs, cans, rocks and flares on Tuesday by some of the hundreds of people who attended a protest in the English southern coastal city of Southampton, where Henry Nowak was killed in December. Two people were arrested and 11 officers and a police dog were injured, police said.

Nowak's death has triggered debates about policing and knife crime and has spurred claims by far-right activists and politicians that there is bias against white people in the justice system.

Nowak...