BRITAIN-RUSSIA-POLICE-ESPIONAGE

A horseshoe hangs above the entrance to a residential property in Salisbury, southern England, on March 6, 2018, as a British Police Community Support Officer stands on duty outside. The house is believed to have been cordonned off in connection with the major incident which started at The Maltings shopping centre in Salisbury on March 4. British police raced on March 6 to identify an unknown substance that left a former Russian double agent fighting for his life, in what a senior lawmaker said bore the hallmarks of a Russian attack. Moscow said it had no information about the "tragic" collapse of the man, identified by the media as Sergei Skripal, in the quiet southern English city of Salisbury on Sunday, but said it would be happy to cooperate if requested by British authorities. Specialist officers from the counter-terrorism squad are helping investigate the incident, which also left a 33-year-old woman -- reported to be Skripal's daughter Yulia -- in a critical condition in what is feared to be a poison plot. / AFP PHOTO / Chris J Ratcliffe (Photo credit should read CHRIS J RATCLIFFE/AFP via Getty Images)