A woman was slapped in the face on a bus in front of her five-year-old son during a row about space for pushchairs.
The 29-year-old Asian woman boarded the route 86 bus in Romford, east London, with her five-year-old son and was confronted by two women, both with pushchairs, who had already boarded.
One of the two women got into an argument with the victim over where the prams should be moved to.
Police say she became angry and violent towards her and fellow passengers, before slapping the terrified woman across the face, causing a laceration to her upper lip.
The suspect and the younger woman she was with then both got off the bus towards The Brewery shopping centre in Romford.
Detectives now want the public’s help in finding her, and have released CCTV footage from the bus.
She is described as a slim black woman in her late forties, 6ft tall, with her hair in a bun and wearing a black hooded jacket with front zips, black trousers and black trainers with white soles.
She also had a black bag and was pushing a grey pram.
Anyone with any information is asked to call police on 101 or 07825 386 484, or call Crimestoppers anonymously on 0800 555 111.