Sudan needs to reach a new political agreement by June, United Nations and African Union envoys warned on Thursday, as medics said two protesters had been killed in the latest round of anti-military demonstrations since a coup in October. Political deadlock in Sudan following the coup has contributed to new pressure on a crippled economy and a stand-off between protesters and security forces. “All indications show the country is in grave danger,” African Union envoy Mohamed Hassan Lebatt told reporters, as he announced a joint effort to push for talks in partnership with the United Nations. “W…