Police arrest woman on suspicion of grievous bodily harm after 3 am attack on Pinner Road

A woman is recovering from a serious head injury after a violent incident unfolded in the early hours of Sunday morning on a residential street in Harrow.

Emergency services rushed to the scene on Pinner Road at around 3 am on April 13 after receiving reports of a woman injured during a disturbing altercation. She was quickly taken to St Mary’s Hospital, where medics confirmed her injuries were serious but not considered life-threatening or life-changing.

The scene that greeted responders was one of controlled chaos. Blue flashing lights lit up the north-west London street, while police tape sealed off a stretch of road as forensic teams in white suits combed the area for evidence. Locals awoke to the aftermath, shocked by the scale of the response.

Photographs captured by MyLondon show a sprawling police presence—officers standing guard, evidence markers dotted across the pavement, and forensic investigators meticulously documenting every detail. The cordon remained in place for several hours as detectives pieced together the timeline of events.

The Metropolitan Police confirmed that a woman has been arrested on suspicion of grievous bodily harm (GBH). She was taken into custody shortly after officers arrived at the scene.

In a statement released on Sunday morning, a Met spokesperson said: “Police responded to reports of a female who had sustained a serious head injury on Pinner Road at around 03:00hrs. One female was arrested for grievous bodily harm. She remains in custody while enquiries continue.”

The nature of the incident remains unclear, but investigators are treating it as a serious assault. Police have not yet revealed the relationship between the two women or what may have sparked the altercation.

The sudden outbreak of violence in the quiet north London borough has left residents unnerved. “It’s not the kind of thing you expect to see around here,” said one local, who asked not to be named. “We woke up to flashing lights and a big police presence. It was very tense.”

Police are now appealing for any witnesses who may have seen or heard anything unusual around the time of the incident. CCTV from surrounding businesses and homes is being collected, and officers have begun door-to-door enquiries in hopes of unearthing key details.

The arrested woman has not yet been charged. Detectives are continuing to question her as they work to determine the full sequence of events. For now, she remains the sole suspect in what police are treating as a serious case of assault.

The injured woman is understood to be in a stable condition and is receiving further treatment and support at hospital.

Forensic teams wrapped up their investigation at the scene by mid-morning on Sunday, but a visible police presence remained in the area to reassure the community and assist with ongoing enquiries.

As Harrow residents process the shocking events of the weekend, the Metropolitan Police have pledged to uncover exactly what happened during those early morning hours on Pinner Road—and to ensure those responsible are brought to justice.

Anyone with information is urged to contact police on 101, quoting reference 1221/13Apr, or anonymously via Crimestoppers.