LONDON — A man wielding a sword attacked members of the public and police officers in a east London suburb, killing a 13-year-old boy and injuring four others, authorities said Tuesday.

A 36-year-old man was arrested at the scene, police said, adding that the incident is not being treated as terror-related or a “targeted attack.”

Two police officers were in hospital being treated for stab wounds. Two other people were also injured.

The Metropolitan Police said they were called early…