Olympic Games organisers in London said they were looking into a tabloid’s report claiming that a worker had been able to sneak a fake bomb—a plastic container with batteries, a phone and modeling clay—into Olympic Park.

The Sun newspaper acknowledged that the unidentified worker had been “properly vetted” and “thoroughly searched” once before entering the park but said he was later able to leave the park and reenter without being challenged. The tabloid claimed that he managed to take in a container that looked like a “dummy Semtex device” and trumpeted what it alleged was the discovery of a “terrifying flaw” in Olympic security.

“Clearly a Tupperware box containing batteries, a mobile phone and some loose wires would not pose a threat on a construction site,” said a statement from the London Organising Committee of the Olympic Games and Paralympic Games. British tabloids routinely have reporters or others sneak into high-profile venues ahead of major events to highlight alleged security failings.