Red paint was daubed over walls at Twickenham Stadium in west London in protest of an arms conference taking place at the venue, a pro-Palestine group has said.

The Met Police said officers were alerted at 01:20 on Monday and four people were seen running from the scene.

The paint was sprayed ahead of the International Armoured Vehicles conference, which began later on Monday.

Protest group Palestine Action said on its website that it was behind the move to protest arms sales to Israel.