LONDON (Reuters) - Police made a second arrest on Friday in connection with the death of a teenage boy, stabbed in broad daylight in a busy shopping street in an upmarket area of north London.

The Metropolitan Police said officers arrested a 17-year-old boy at his home address on Friday evening, after Nassirudeen Osawe, 16, was stabbed to death in Islington on Thursday.

He has been taken into custody at an east London police station.

An 18-year-old man was arrested in the vicinity of the incident shortly after it happened and is being held at a north London police station.

Officers were called to reports of an altercation outside the York pub on Upper Street at around 2.30 pm on Thursday.

Nassirudeen was pronounced dead at the scene and a second victim, aged 17, was taken to a north London hospital suffering from stab wounds.

He remains in hospital, but his injuries are not believed to be life-threatening.

Detective Inspector David Whellams, of the Met's homicide and serious crime command, said on Friday it was too early to speculate as to the circumstances that led to the incident.

"We do know that Nassirudeen was with two friends, one of whom was also stabbed, when the they were in an altercation with a male suspect - resulting in Nassirudeen being fatally stabbed.

"Upper Street in Islington is a very busy place at any time of the day, but at 2.30pm in the afternoon both the pavements and the roads are busy and I am sure there are many people who must have witnessed the altercation between these young men."

He urged witnesses to come forward.

There have been a series of stabbings in London this year, many of them fatal and many of them believed to be linked to battles between teenage gangs.