EDMONTON, Alberta — A Canadian man accused of conspiring to kill Americans was denied bail Friday while he fights extradition to the United States.Alberta judge Eric Macklin said the crimes Faruq Khalil Muhammad 'Isa, a Canadian citizen and Iraqi national, is accused of are extremely serious and it's essential he remain in custody.Muhammad 'Isa, 38, has been charged in the US with supporting a multinational terrorist network that took part in a suicide bombing that killed five soldiers in Iraq. If convicted, he faces life in prison.He was arrested in Edmonton, Alberta, last month on a US warrant after a joint investigation by the FBI's New York Joint Terrorism Task Force, Royal Canadian Mounted Police and Tunisian authorities.US officials said Muhammad 'Isa, also known as Sayfildin Tahir Sharif, was a long-distance conspirator and booster for Tunisian jihadists in Iraq, urging them in a series of messages to kill "dog Americans" in suicide bombings.