Jane Martinson reports from the hearing: "He was sitting four rows back, calmly walked up with a plate of shaving foam – smacked it in Rupert’s face – Wendi intervened."
Reports claim the assailant is a UK Uncut activist.
The BBC’s Laura Kuenssberg thinks it’s a bandage on the young man’s face – Nick Robinson says it is shaving foam and the young man hit Rupert Murdoch with it.
The suspect looks like he has a substance like white paint on his face.
My colleague Jackie Ashley tells Twitter: "Wendi [Murdoch’s wife] can throw quite a punch."
The BBC says the young man has been handcuffed. Sky showed the footage again – it seemed to be an attack from Rupert Murdoch’s left.
A young man in a checked shirt has been detained by police.
Someone has just tried to attack Rupert Murdoch. His wife Wendi seemed to slap the person.
Additional details about today’s testimony can be found here.