Tunisia's Interior Ministry says the death toll in an explosion targeting the presidential guard has risen to 13, and the attacker or attackers remain unidentified.<br />Ministry spokesman Walid Louguini told The Associated Press on Wednesday that another body was discovered in the charred remains of a bus carrying presidential guards that exploded in central Tunis on Tuesday.<br />Louguini could not confirm or deny Tunisian media reports that the body could be that of a suicide bomber who jumped on the bus right before the bomb exploded.<br />Troops fanned out around the capital and the president declared a month-long state of emergency after Tuesday's attack.
