One of Joss Stone's neighbours has been called as a witness.
She is telling the court that three weeks before the alleged incident she saw an old red car, with three people inside driving slowly close to Joss Stone's home in Devon.
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Mohanna Abdhou, known as Montana, was out with friends when two attackers cycled up to them and opened fire in Brent, north-west London.
The US president tweeted that Mrs May gave him "full details" of the incident during talks while he attended summits in Europe.
Police have raided another home in connection with the Manchester Arena attack as officers made a fresh arrest as part of the investigation.