Cooper Temple Clause and Razorlight have been caught up in the plot that poisoned former Russian spy Alexander Litvinenko.
The ex-KGB man died in London on November 23, after ingesting radioactive substance polonium-210.
However since his death, a radioactive trail inadvertently left by the killers has been followed by authorities to jet planes recently used by both bands.
Traces of polonium-210 were detected on recent British Airways flights from Moscow, both of which Razorlight and Cooper Temple Clause travelled on.
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