Police responding to the incident found petrol at the site but no explosives. Five suspects were detained and have since been released on bail. Burnham, whose remit as Greater Manchester Mayor does not cover the base, made the allegation publicly — a detail worth noting, since it was not a statement from the Home Office, the Metropolitan Police Counter Terrorism Command, or any body with direct investigative authority over the case.
Tehran has flatly rejected any involvement, according to Euronews. That denial is unverified, as is Burnham's claim: neither the United Kingdom government nor law enforcement has publicly confirmed Iranian state direction behind the incident.
What is established is narrower: a security breach occurred at an airbase used by US forces, flammable material was found, and five people are on bail. The gap between that established fact and Burnham's assertion of Iranian participation is the operative question — not because the assertion is implausible, but because no authority with access to the evidence has yet confirmed it publicly. Whether a formal government attribution follows, or whether this remains a politician's characterisation of intelligence he was briefed on separately, is unresolved.
Marcus Azzopardi 
Dua Mifsud 
Ryan C