Three relatives have been arrested by police at Gatwick Airport in connection with the death of 10-year-old Sara Sharif.
A £20,000 reward is being offered as Met Police Detectives investigating the murder of Milton Hurlington in Wembley have made a further arrest.
On Saturday, forensic officers were present at the scene of the incident in north-west London, and a significant police presence could be observed in the area. Granville Road was completely cordoned off, and investigators were conducting inquiries near a primary school adjacent to an apartment block.
The family of a woman killed after her husband carried out a frenzied attack have spoken of their devastation at their loss.