Warsaw : The number killed from a methane explosion at a Polish coal mine rose to five after two gravely burned miners succumbed to their injuries overnight, the hospital treating them said yesterday. One worker died in the accident on Oct 6 at the Myslowice-Wesola mine in southern Poland and 28 were hospitalized with severe burns. Two miners later died at the burns until of the hospital in Siemianowice Slaskie.