Two men have been arrested after a nursery teacher was shot dead while celebrating her birthday in north west London, police said.
Sabrina Moss, 24, of Edgware, who has a four-year-old son, was gunned down along with a friend in Kilburn High Road, north west London, early yesterday.
Another 24-year-old woman is in hospital. Her injuries are not thought to be life-threatening.
Police said the second man is being held at a north London police station, and the first remains in custody, Scotland Yard said.
A post-mortem examination was due to begin today.
Detective Chief Inspector John Sandlin of the Metropolitan Police said: "At this early stage, I believe the two women were innocent parties who were caught in the wrong place at the wrong time.
"Enquiries continue to establish the full circumstances of this tragic incident."
Scotland Yard said officers were called at 4.12am to reports of shots fired in the street in Kilburn High Road, at the junction with Messina Avenue.
Police and London Ambulance Service found two women suffering from gunshot injuries and both were taken to London hospitals.
Sabrina was pronounced dead later. She had been out celebrating her 24th birthday with friends.
Mr Sandlin said: "I am appealing for anyone who witnessed the shooting, or who saw anything suspicious in the Kilburn area early this morning, to call police.
"In particular, I need to hear from anyone who saw two males who came into the High Road from Messina Avenue and, after the shooting, made off on foot back along Messina Avenue."
Tributes to Ms Moss flooded onto social networking site Twitter, with many of her friends reporting that she had a young child.
Adjei Adu wrote: "My heart goes out to her family and the lil one she's left behind, sleep well Sabrina Moss."
Leila Hassan tweeted: "My Thoughts Are With Your Family... A Beautiful Young Woman, Mother and Daughter!"
Another tweet read: "Lost the cousin I was close with when I was a child.. R.I.P Sabrina Moss."
Anyone with information that might assist the investigation was asked to call the incident room at Hendon on 020 8358 0300. To remain anonymous, call Crimestoppers on 0800 555 111.
