Presidential hopeful Hamdden Sabahi has called onresidents of Aswan to refrain from violence after deadly clashes between twofamilies that left 25 people dead."A call to the people of Aswan, the source of originality, let us stem our blood andend the sedition that burns us all," Sabahi wrote on Twitter.The clashes, the worst ever tribal bloodshed, broke out on Friday between thefamilies of Al-Halayel and Al-Dabodeya tribes.