Two Russian men are accused of attempting to kill former KGB agent Sergei Skripal on March 4 — the same day they flew to Moscow. “We have no evidence that they re-entered the UK after that date,” says Assistant Commissioner Neil Basu of the U.K.’s counter-terrorism force.

Two Russian men are accused of attempting to kill former KGB agent Sergei Skripal on March 4 — the same day they flew to Moscow. “We have no evidence that they re-entered the UK after that date,” says Assistant Commissioner Neil Basu of the U.K.’s counter-terrorism fo