A security review has been launched across UK military bases after pro-Palestinian activists broke into RAF Brize Norton and sprayed two military planes with red paint.
Prime Minister Sir Keir Starmer condemned the action as "disgraceful", saying it was an "act of vandalism".
Footage posted online by Palestine Action on Friday showed two people inside the Oxfordshire airbase in darkness, with one riding on a scooter up to an Airbus Voyager and spraying paint into its jet engine.
South East counter terrorism police later confirmed its specialist officers were investigating the incident alongside Thames Valley Police and the Ministry of Defence (MoD).
Downing Street said the incident had not blocked any planned aircraft movements or stopped any operations.
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