A student was killed in the Senegalese city of Saint-Louis amid violent protests against the postponement of the presidential election, the interior ministry said. Clashes between security forces and protesters gripped Senegal's capital and other cities on Friday, the first widespread unrest over the delay of a vote that many fear could lead to protracted instability. In a statement, the ministry said it had been informed of the death of student Alpha Yero Tounkara and that it would be investigated, but denied its forces were to blame. "The Defence and Security Forces did not intervene to maintain order on the university campus…