A safety watchdog has launched a full investigation into the partial collapse of an office block, which led to the evacuation of Hounslow bus station.

The Health and Safety Executive (HSE) was informed after a large chunk of Hounslow House came crashing down as it was being demolished on Tuesday (July 15), sending debris and dust flying.

Having carried out initial enquiries, a spokeswoman for the organisation today said it was now launching a full investigation into the collapse, in which nobody was injured.

She also said the demolition firm GBM UK had been issued with a prohibition notice preventing further work on Hounslow House until improved safety measures have been introduced. The order does not ban work on the rest of the site.

She was unable to say how long the investigation would take.

The HSE had previously said a full investigation may not be deemed necessary.

A spokeswoman for GBM UK said it would not be appropriate to comment until the investigation had been completed.

Tesco owns the land which is being cleared to make way for a housing development, including a 21-storey tower, for which a planning application is expected to be submitted within the next month.