Police are locked in a tense ten-hour stand-off with a man allegedly throwing items from a roof.
The man, who appears to be in his 20s, is said to have been breaking off masonry such as chimney pots as well as television aerials since the early hours of the day.
Several officers with riot shields from the Metropolitan Police Territorial Support Group, which specialises in public order policing, remain on the scene at Russell Gardens Mews in west London.
A man, who appears to be in his 20s, was reported throwing things from the roof of an address in west London
Eye witnesses said the man was throwing chimney pots and television aerials
Officers from the Metropolitan Police's Territorial Support Group have been in attendance at the scene in West London
It is understood the man made his way onto the roof after climbing a tree nearby
Eye witnesses said the man, who was wearing a fluorescent coat, a green woolly hat, dark trousers and casual shoes, was throwing things at the ground.
It is understood he made his way onto the roof of terraced properties after initially climbing onto a tree.
A Scotland Yard spokesman said: 'Police were called at 04:21hrs to reports of a man on a roof in Russell Gardens Mews W14.
'He threw a number of items down onto nearby railway tracks.
'Officers are trying to speak to him following concerns for his welfare.'
It is not known if anyone has been injured.
The main is said to have climbed onto the terrace roof after scaling a tree nearby at around 4am
Neighbours crane their necks to try and have a look at what is happening
The man, who appears to be in his 20s, was wearing a fluorescent coat, a green woolly hat, trousers and casual shoes
TfL said it suspended the line between Willesden Junction and Clapham Junction this morning as a precaution while the incident is ongoing
TfL said it suspended the line between Willesden Junction and Clapham Junction this morning as a precaution while the incident is ongoing.
A London Fire Brigade spokesman said: 'Firefighters are supporting colleagues from the Metropolitan Police Service at an incident on Russell Garden Mews, Kensington.
'The Brigade was first called about the incident at 1019, and crews from Hammersmith and Paddington Fire Station are currently on scene.'