21.   Three were executed and one was killed by cyanide gas.

22.   Zeevi said that due to a technical mishap, the cyanide gas was not released.

23.   If mixed, the two chemicals would generate lethal cyanide gas, police said.

24.   Yagisawa allegedly released chemicals able to produce deadly cyanide gas at Shinjuku Station, one of the largest railway stations in Tokyo, in May last year.

25.   Phosphorus trichloride and other Sarin ingredients, as well as sodium cyanide that can be turned into lethal cyanide gas, were found.

26.   Sodium cyanide was found in devices intended to generate cyanide gas at a Tokyo subway station in May and at a train station in July.

27.   The amount could be used to produce enough poison cyanide gas to kill thousands of people, reports said.

28.   The chemicals, if mixed, could have produced a deadly cyanide gas.

29.   The man reportedly said he would release lethal cyanide gas if he was not paid.