Crime/ Deadly radioactive Polonium-210

…Traces of the radioactive chemical were found at locations across the capital, as well as at the hotel in Grosvenor Square where Litvinenko was believed to have been poisoned, the inquiry heard.

The spread of the chemical traces suggests not only multiple attempts on Litvinenko’s life, but also the likelihood that “many thousands” of Londoners may have been at risk from radioactive poisoning.

Tam said a public health alert was issues around the time of Litvinenko’s death after polonium traces were found “in large numbers of places across London.”

Public inquiry into Litvinenko poisoning begins