The two suspects sprayed red paint into the planes' turbine engines with repurposed fire extinguishers and caused further damage with crowbars, the group claiming to behind the attack said.
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Police in the United Kingdom are searching for suspects and the military is reviewing its security procedures after pro-Palestinian activists broke into a Royal Air Force base in Oxfordshire and damaged two planes with red paint, officials said on Friday.
The group Palestine Action said two members entered RAF Brize Norton, some 110 kilometres west of London, on Wednesday and used electric scooters to approach the Voyager jets, which are used for air-to-air refuelling.
The duo sprayed red paint into the planes' turbine engines with repurposed fire extinguishers. They caused further damage with crowbars, according to the group, which released video footage appearing to show an individual approach a jet and spray paint into the engine.
The activists left the base without being detained, Palestine Action said.
The group said in a statement that "despite publicly condemning the Israeli government, Britain continues to send military cargo, fly spy planes over Gaza and refuel US/Israeli fighter jets."
The Ministry of Defence confirmed the incident, saying: "We strongly condemn this vandalism of Royal Air Force assets."
UK Prime Minister Keir Starmer called the vandalism "disgraceful" in a post on X.
Thames Valley Police said in a statement that it had "received a report of people gaining access to RAF Brize Norton and causing criminal damage."
Officers were working with staff at the base and military police to arrest the perpetrators, the force said.
The government said two planes were being checked for damage and that the vandalism had not stopped any planned aircraft movements or operations.
"A full security review is underway at Brize Norton," Starmer's office said. "We are reviewing security across the whole defence estate."
Planes from RAF Brize Norton regularly fly to RAF Akrotiri in Cyprus, Britain's main air base for operations in the Middle East.
The UK has sent more Typhoon fighter jets and Voyager tankers to Cyprus since the Israel-Iran conflict started a week ago for what Starmer called "contingency support."
Iran has threatened to attack US, French and British bases in the region if those countries help Israel fend off Iranian strikes.