By El Tayeb Siddig KHARTOUM (Reuters) – Sudanese security forces fired tear gas at protesters on Friday near the presidential palace in Khartoum, a day after nine people were reported killed during the largest anti-military rallies for months. Protest groups demanding a return to democratic rule have said they will organise an open-ended campaign of sit-ins and other peaceful actions in response to the deaths. Medics aligned with the protesters said the nine people were mostly killed by gunfire from security forces in Khartoum and the adjoining cities of Omdurman and Bahri. Sudan’s ruling coun…