At midnight on NUMBER@1 December NUMBER@2 , the plant released NUMBER@3 tonnes of toxic methyl isocyanate -LRB- MIC -RRB- gas , exposing more than NUMBER@4 people to toxic gases .

On NUMBER@1 December NUMBER@2 , the plant released NUMBER@3 tonnes of toxic methyl isocyanate -LRB- MIC -RRB- gas , exposing more than NUMBER@4 people to toxic gases .
