Police have issued an urgent warning to parents, after two babies were apparently given bottles of bleach by a woman on Eltham High Street.
The woman has been described as "heavily built with white hair" and aged around 50.
WARNING ! Last 1/2 hr. #Eltham High St. White female in 50's giving children in pushchairs bottles containing believed bleach
More top news
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.