Crimestoppers has put up a reward of up to £10,000 in a bid to help capture the murderers of Mohanna Abdhou.
The reward will be available to anyone providing information to the independent charity that leads to the arrest and conviction of the person responsible for the murder of the 20-year-old, who was gunned down in Kilburn on May 26.
It comes as Metropolitan Police issue CCTV stills of two males on bicycles believed to be responsible for the shooting.
The force has stressed it is an opportunity for people to give vital information anonymously.
The images were captured as the pair made their way to and from Malvern Road, where the victim, also known as Montana, was shot near a children’s playground at 8.54pm.
She was pronounced dead at the scene a short while later, and a post-mortem examination on May 27 gave the cause of death as a single gunshot wound.
Police enquiries have established that she and her friends were approached by two males on bicycles.
The CCTV footage shows the two suspects at 8.53pm cycling along Malvern Place, seconds before turning into Malvern Road where the shooting took place.
Less than a minute later, and after the incident, they were seen in Shirland Mews in Maida Vale, approaching Fernhead Road, and again seconds later in Fernhead Road.
The two males are described as being slim to medium build, both wearing dark clothing and concealing their appearance through the use of face coverings.
The Crimestoppers reward is applicable only for information passed directly to Crimestoppers rather than the police.
Detective Chief Inspector Andy Partridge said: “The Crimestoppers reward is a significant one and we hope that this will encourage people to come forward and put a name to those we are seeking to identify.
“Valuable information has been passed to us but we are certain that people in the local community know who has committed this horrific attack.
Shooting of Mohanna Abdhou in Kilburn
“I would like to reassure those who are apprehensive about coming forward; you have the choice to speak to Crimestoppers anonymously.
"If you know something then please say something, do not keep this to yourself.
“My detectives have already searched meticulously through hours of CCTV and have managed to track the movements of those we believe are responsible for killing an innocent woman as she stood talking with friends.
“Whilst this work continues I believe the release of these images presents a realistic chance of obtaining valuable information.
“This attack was carried out yards from a children’s playground and took place when lots of people were out enjoying the sunshine.
“I am convinced that upon seeing the CCTV images someone will recall seeing these two individuals in the vicinity of Malvern Road and I would urge those who do have information to come forward.
“I would like to take this opportunity to specifically appeal to those who are harbouring the individuals responsible - those mothers, those sisters, those girlfriends.
“If you have the slightest indication that your loved one may have been involved now is the time to say something. Please do not remain silent, do the right thing and come forward.
“These individuals should not be shielded by friends or family, or supported in any way.
“No right-minded person would want those responsible for depriving Mohanna’s family from ever seeing her again to evade capture.
“Mohanna’s family deserve answers and that will only happen if the local community tells us who carried out this attack.”
A 21-year-old man arrested at the scene May 26 has been released under investigation pending further enquiries.
Two other men, aged 19 and 20, were arrested in west London on Wednesday (May 31) on suspicion of murder, and bailed pending further enquiries.
Anyone who witnessed the incident or has any information can call the police incident room on 020 8358 0300 or via Twitter @MetCC, or give information to Crimestoppers on 0800 555 111 or online at crimestoppers-uk.org
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