A group of protesters have been arrested for throwing white paint at the gates of Downing Street.
The protesters were dressed in judges' wigs and gowns
A spokesman said protesters were concerned about the narrow remit of an inquiry to examine UK intelligence on Iraq's WMDs.
The attack took place at about 0900 GMT and five people were arrested for criminal damage
Police are considering whether it is in the public interest to formally charge the protesters.
The demonstrators were said to be dressed in judges' wigs and robes.
The Prime Minister's official residence is the subject of protests most days, police said.
And there are always a number of police officers on Downing Street itself.
But since the road was closed to the public in 1989 for security reasons, demonstrators have not been able to reach Number 10.
Wednesday's paint was later cleaned off by firefighters using high-powered jets.