Prime Minister Sir Keir Starmer has urged restraint following Israeli strikes targeting Iran's nuclear programme.
Fears of a full-scale conflict have been stoked by warnings of "severe punishment" from Iran's Supreme Leader Ayatollah Ali Khamenei and reports of drone launches in response.
A Cobra meeting is expected early this afternoon to discuss the UK response to the emergency situation.
Foreign Secretary David Lammy has also cancelled a planned trip to Washington DC to meet his his counterpart Marco Rubio, although there is no plan for a ministerial statement in the House of Commons.
UK officials said the UK did not play any part in the action overnight but is continuing to monitor the situation.
