A teenager has been charged after allegedly trying to take a knife into court.
The 17-year-old from Plaistow was arrested while trying to enter the Old Bailey on Tuesday while a murder trial was taking place.
Police said he has been released on bail to appear at a youth court in January.
His arrest was revealed by an Old Bailey judge on Thursday after another 17-year-old was found guilty of the murder of 15-year-old drill rapper Jordan Douherty.
The victim, who performed under the name Young Valenti, was knifed to death after a 16th birthday party descended into violence in June.
Judge Anthony Bate said his attention had been drawn to the public gallery due to the presence of a large number of people.
He said: “I understand their presence was not altogether benign. One of them was arrested having been found in possession of a knife.”
The judge said the arrest was not related to the case and that the knife was found by security staff at the public entrance to the building.
A City of London police spokesman said: "A 17-year-old male from Plaistow, London, has been charged with possession of a bladed article.
"He has been released on bail to appear at Highbury Corner Youth Court on Monday January 7 2019.
"He was arrested on Tuesday December 18 while attempting to enter the Central Criminal Court."
Schoolboy Jordan died on June 23 after he was chased by a gang of youths in Romford and stabbed twice, including a "catastrophic injury" to the heart.
Two other boys, aged 16 and 17, were found guilty of conspiracy to commit grievous bodily harm with intent over the stabbing, while William Nayya-Welly, 20, pleaded guilty to perverting the course of justice before the trial.
They will be sentenced alongside the 17-year-old convicted of Jordan's murder next year.
