Until Burnham's remarks, Britain had not linked the incident to Iran, though counter-terrorism police have said their investigation included the possibility of foreign state involvement. Tehran has rejected any involvement in Sunday's incident at the US-used airbase, where police found petrol but no explosives and five suspects have been released on bail. Key points and original sources are listed below.

• Until Burnham's remarks, Britain had not linked the incident to Iran, though counter-terrorism police have said their investigation included the possibility of foreign state involvement.S1

• Tehran has rejected any involvement in Sunday's incident at the US-used airbase, where police found petrol but no explosives and five suspects have been released on bail.S2

• UK Prime Minister Andy Burnham on Wednesday insisted that there were "strong indications" that Tehran was involved in a security incident on Sunday near an airbase in England that the US military uses in its war against Iran. The British government has still n...S3

• UK Prime Minister says there are ‘strong indications’ Iran played a part in the suspected RAF Fairford airbase plot.S4