A man in his fifties has been arrested on suspicion of grievous bodily harm after a young pregnant woman had a pillowcase put over her head and was repeatedly punched.
The 20-year-old victim, who is around 28 weeks' pregnant, was attacked at around 6.30pm last Thursday on Manor Road in Stamford Hill, north London.
She told officers she had been approached from behind by the suspect, who put a pillow case over her head before assaulting her.
The suspect was arrested at an address in Haringey and is now in custody at an east London police station, Scotland Yard said.
The Metropolitan Police said inquiries are ongoing to establish a motive and that at this stage the incident is not believed to be linked with any other offences.
The woman was taken to hospital for treatment for minor injuries.
Rabbi Herschel Gluck, president of the Shomrim neighbourhood watch group in Stamford Hill, said the woman has been left "traumatised" by the incident.
The rabbi said "all parties" must ensure the safety of women and girls in the area "is put on the front burner and is assured".
The Met said officers have been conducting patrols in the Stamford Hill area to provide reassurance to the local community.
Anyone with information is asked to call police on 101, quoting reference Cad 6517/18Mar.