The Metropolitan Police's Operation Trident targets gang culture in the capital, they invited gang members to come forward and offered help to those wishing to leave gangs, and warned those that do not, "we will come after you."
Grant has previous convictions for robbery and possession of an offensive weapon, Kolawole for affray, and McCalla for robbery, affray, possessing an offensive weapon with intent and violent disorder.
Judge Stephens told the trio:
Not one of you has, in my judgement, shown a sliver of remorse
You, Grant, were the gunman and the other two your fully supportive lieutenants backing up all your actions to the hilt and giving you the support and encouragement to carry out these terrible deeds.
In my judgement, this is an exceptional case of the utmost gravity.
Shooting into a shop, a confined space where it was known there were people present, is an attack on society itself by men who saw themselves as outside the law and above the law.
Judge Martin Stephens QC said the trio had gone out with a "determined, premeditated intention to kill" that day.
Judge Stephens continued:
Mr Selvakumar was hit in the head but miraculously survived with a piece of bullet remaining in his head.
Five-year-old Thusha, who was dancing around with her family in the shop, was hit in the body. Only the skill and devotion of the medical teams who became involved saved her life but she remains paralysed below her chest and this condition is permanent.
This simple but devastating statement of the essential facts of the case illustrate the gravity of these offences, riddled as they are with aggravating factors.
Three men were today jailed for life at the Old Bailey for a gang-related shooting that left a five-year-old girl paralysed. Nathaniel Grant will serve a minimum of 17 years, Kazeem Kolawole at least 14 years and Anthony McCalla at least 14 years.
Nathaniel Grant, Anthony McCalla and Kazeem Kolawole were hunting down a rival gang member when they shot Thusha Kamaleswaran at her aunt's south London shop in March last year. They will be sentenced today.
Three men will be sentenced today after being convicted of shooting a young girl in a gangland shooting in south London. Now six years old Thusha Kamaleswaran is in a wheelchair and paralysed for life.
Nathaniel Grant, Kazeem Kolawole and Anthony McCalla were convicted by an Old Bailey jury of causing her grievous bodily harm with intent.
The shooting happened at the Stockwell Food and Wine Store on in March 2011.
The parents of six-year-old Thusha Kamaleswaran, who was left paralysed after being shot in Stockwell, say they are "all hoping that one day a miracle will happen" and their little girl will walk again.
Thusha's brother, Thushen, told ITV News he remembers his sister "falling down" after she was shot by three teenage gunmen in Stockwell. As the siblings sit side-by-side Thusha shows Crime Correspondent Jon Clements her love of maths and numbers puzzles.