The jury was played a series of CCTV images today, showing the suspect wearing a niqab travelling alone waiting for the victim, Naomi Oni, to finish work.
Suspect travelling alone up the escalator from Stratford tube station
The victim, Naomi Oni, is describing her relationship with Mary Konye. She had known her since they were 12 - and the relationship was "rocky". In April 2011 the pair fell out and did not speak again for 5 months.
Naomi Oni described a text exchange in which Mary Konye described herself as an "ugly monster". Oni says the test exchange included insults about each other's looks, body shape and hair.
When the friendship resumed Mary Konye told her she "was so angry and the time they fell out she wanted to throw acid at her". She was talked out the attack by a friend who warned her she could go to prison.
The prosecution has called its first witness, Naomi Oni, who is describing the day she was attacked. She tells the jury she worked a shift which ended at 11:30pm at the Victoria Secrets store at the Westfield shopping centre in Stratford.
Naomi says she did not recognise anything out of the ordinary on the journey home
Earlier the defence counsel unexpectedly admitted her client Mary Konye is the woman in the veil and that she followed the victim. But the accused denies throwing the acid with intent to disfigure, maim and cause grievous bodily harm.
A court has heard how a student wearing a niqab followed her friend before throwing acid in her face. 21-year-old Mary Konye is accused of disguising herself with a veil before attacking Naomi Oni near her home in Dagenham in east London in December 2012.
CCTV in court shows the alleged attacker following the victim on two Tube trains and a bus before launching the attack. The CCTV shows a woman in a full veil following Naomi Oni.
Footage clearly shows the accused following the victim at a safe distance, occasionally pausing to make sure she's not spotted.