Barcelona coach Pep Guardiola said he was worried over the safety of African duo Yaya Toure and Seydou Keita after Togo's team bus was attacked in Angola. Gunmen opened fire on the bus on Friday in the Angolan enclave of Cabinda to kill two members of Togo's delegation and wound several others, two days before the African Cup of Nations gets underway. Barcelona midfielders Toure and Keita are away on international duty with Ivory Coast and Mali respectively and Guardiola said he was concerned over their safety. "We are trying [to contact Toure and Keita]," Guardiola told Spanish paper El Mundo on Saturday. "They are obliged to know the level of danger. Human life and everyone's safety is the most important thing of all." Ivory Coast, who play in the same Group B as Togo, open their campaign against Burkina Faso on Monday. Mali will face hosts Angola in Group A in the Nations Cup opener on Sunday.