© Licensed to London News Pictures. 12/04/2017. London, UK. Police tape surrounds an alleyway off Newnham Close where a 19 year old man, named locally as Abdullahi Tarabai,  was murdered yesterday after reportedly being chased though a housing estate in Northolt. This is the second fatal stabbing in the capital in 24 hours. The location is adjacent to a gun siege from October 2016. Four men have been arrested Photo credit: Peter Macdiarmid/LNP