premise: Twenty-two miners were confirmed dead and five others missing in Saturday's gas blast in Yuanhua Coal Mine in Jixi, a city in northeastern Heilongjiang Province.
  Three managers responsible for the blast have been arrested, said local police. An investigation shows at the end of August, the mine was forced by local government to halt production due to outdated work safety license, but the owners continued production.
  In another tragedy, 32 miners were killed and 28 injured in a colliery gas explosion at Changyuan Coal Mine in Fuyuan, a county in southwestern Yunnan Province.
  Investigation shows the mine owners started production at the Chuangyuan mine before they got all the required licenses.
   What happened because of a colliery gas explosion in Fuyuan?
hypothesis: five others missing