Cigarettes. The reason I don't believe there were attackers camped around them waiting for the right moment to kill.
Like this was a time that EVERYBODY smoked cigarettes in the US and apparently the USSR.
If I'm to believe that a group of men with malicious intent was hiding out and waiting to pounce, then I am certain that at least one among a group of killers would be a smoker if not more and evidence would be left behind.