Ofcom has released a statement regarding the future of RT in UK.
A number of MPs have called for the Russian news channel to be banned following the incident in Salisbury.
RT operates in the UK under licenses issued by Ofcom.
The regulatory body said it heard Prime Minister Theresa May's statement to the House of Commons yesterday and will now await her further statement tomorrow.
"We will then consider the implications for RT’s broadcast licences," said Ofcom.
Update at 14:45:
Ofcom has released a further statement announcing it has written to ANO TV Novosti, holder of RT’s UK broadcast licences, which is financed from the budget of the Russian Federation.
The letter states that should the UK investigating authorities determine that there was an unlawful use of force by the Russian State against the UK, Ofcom would consider this relevant to their ongoing duty to be satisfied that RT is fit and proper.
Ofcom warned RT it would "carry out our independent fit and proper assessment on an expedited basis, and we would write to RT again shortly setting out details of our process."