The A4 was closed in Hounslow on Wednesday afternoon (September 13) after a collision.
TfL said the A4 Great West Road was closed between Sutton Lane and Lampton Road just before 4pm.
Traffic was at a standstill in the surrounding area and emergency vehicles were seen arriving at the scene.
We will be bringing you all the very latest updates, pictures and video on this breaking news story as it develops.
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Both children injured in this crash have been confirmed as pupils at Lampton School in Hounslow.
The school said they were believed to be “making a satisfactory recovery”.
Here is the latest update from the Metropolitan Police this morning (Thursday September 14):
Police said the boy injured in the collision is believed to be in a ‘non life-threatening’ condition.
Time to close the blog
Thank you for joining us today following the earlier collision between two children and a lorry on the A4 Great West Road in Hounslow.
Emergency services were called to the crash at around 3.30pm where one boy was flown to hospital in serious condition and a girl taken to hospital for minor injuries.
The road remained closed until 8.40pm as investigation works were carried out at the scene.
All roads have re-opened.
No arrests have been made.
Eyewitness describes emergency response to crash
Following the earlier crash we spoke to Karen Thorp from Hounslow who praised all the emergency services for their response to the crash.
Read the full story and see images from the scene: http://www.getwestlondon.co.uk/news/west-london-news/a4-crash-emergency-services-amazing-13617438
Traffic is easing on A4 Great West Road following investigation work between Sutton Lane and Heston Road (eastbound)
Great West Road re-opens eastbound
A4 Great West Road is now OPEN eastbound following an earlier collision.
Motorists are advised to expect delays as congestion will take some time to clear.
getwestlondon spoke to local resident Karen Thorp who witnessed the work of emergency services as they attended to the crash in Hounslow.
Ms Thorp said:
You could see the ambulance crew were working on someone.
Police were there cornering off everything and fire crews there to do anything they could.
Sad the air ambulance was there but amazing how skillfully the pilots are, and they work in such difficult situations.
They have all done an amazing job in a tough situation.”
Speaking about the current traffic situation, she added: “Traffic is horrendous. The vehicle involved – a lorry – is still there.”
Traffic affected around Hounslow
It is a stop-start traffic situation due to the A4 Great West Road closure in Lampton Road in both directions between Bath Road / Lampton Road and Spring Grove Road.
Elsewhere in the borough traffic is being affected.
Motorists are advised to find alternative routes.
Two children injured in lorry crash
Here is our latest story on the A4 crash in Hounslow: http://www.getwestlondon.co.uk/news/west-london-news/a4-crash-two-children-injured-13616979
Great West Road eastbound remains closed while investigation works are carried out following the earlier accident involving a lorry and two pedestrians.
Great West Road re-opened westbound
A4 Great West Rd has re-opened westbound.
Eastbound the road remains closed between Sutton Lane and Lampton Road.
Video: Emergency services respond to A4 crash
Delays up to an hour
Buses serving Hounslow delayed up to an hour due to congestion caused by closure of Great West Road.
Another photo from near the scene
Here is an image posted on Twitter by Osterley and Wyke Green Residents’ Association of the situation on Sutton Road, following a serious crash on Great West Road.
More buses diverted
Transport for London has confirmed at least three bus routes have been placed on diversion while emergency services attend to a serious crash in Hounslow.
Routes 111 and 120 join H91 on diverted routes.
In addition Transport for London has said buses serving Hounslow are delayed due to congestion caused by closure of Great West Road.
While emergency services deal with a serious accident on the A4 Great West Road the H91 bus route has been placed on diversion.
A4 Great West Road/Lampton Road - eastbound -traffic is slow approaching the closure with queues on Upper Sutton Lane with diversions in place.
A4 Westbound traffic on the A4 is slow approaching the road closure at Lampton Road, with delays back to Thornbury Road.
From the Metropolitan Police
The Met Police were called at 3.30pm to Great West Road.
At this stage, two people, both believed to be pedestrians have been injured.
One has been taken to hospital and another suffered minor injuries.
A lorry is believed to be involved.
Road closures remain in place.
Hounslow Council road closures warning
Hounslow Council is alerting people to the road closures in place following the collision.
Accident involving lorry and pedestrian
Reports suggest the accident involved a pedestrian and lorry.
Congestion to Henlys Roundabout
A4 Great West Road is closed in both directions between Heston Road and Sutton Lane due to a serious accident.
Traffic remains at a standstill.
Congestion is reported on A4 Bath Road to Great South-West Road/Burns Way (Henlys Roundabout) and on A4 Great West Road
to Ridgeway Road.
Police remain at the scene dealing with the accident.
Photo from the scene
The London Air Ambulance helicopter has landed in Hounslow.
Emergency services including the police, ambulance and fire brigade are also at the scene.
Hounslow Police posted this image from the scene of the accident.
Officers from Hounslow Police are at the scene dealing with a serious collision on the A4.
Major road closures in place.
London Air Ambulance at the scene
London Air Ambulance has touched down at the scene of a collision in Lampton Road.
Great West Road closed
Part of Great West Road is closed between Sutton Lane and Lampton Road due to a collision.
Traffic is at s standtill.
Motorists are advised to expect delays.