The search for the mother of three abandoned babies in London has been narrowed down to 400 homes as police investigate potential leads.

Police are conducting door-to-door inquiries in East Ham and Plaistow, seeking information and voluntary DNA samples from residents.

DNA tests have confirmed that the three babies share the same parents, prompting extensive search efforts by authorities.

The babies were found under alarming conditions: Harry was discovered in Plaistow Park wrapped in a towel inside a shopping bag, while Roman was found on a bench in a children's playground.

Detectives believe the mother is likely vulnerable and may feel unable to seek help or come forward, indicating she is a victim in need of support.

Investigators suspect the mother may not have the ability to come forward voluntarily due to her potential vulnerabilities.

Despite traditional methods like media appeals and a £20,000 reward, the search for the mother has not yet yielded results.

The National Crime Agency is assisting the investigation with specialized teams, emphasizing that the case is 'very solvable' if the community provides information.

Detectives are also considering the possibility of a fourth abandoned baby and are urging the public to remain vigilant.

All three children were abandoned in areas without CCTV coverage, complicating the investigation despite extensive analysis of available footage.

Detective Inspector Jamie Humm noted that while the investigation is comprehensive, finding the mother remains a significant challenge.

Authorities are treating the mother as a victim and are prepared to offer her necessary support if she is located.