<span style="color: #222222;">Turkey's President Recep Tayyip Erdogan today said that four soldiers have been killed and nearly 20 injured in an explosion at an ammunition depot at a base in southeast part of the country.</span><br />'' <br />''<span style="color: #222222;">Earlier, the Defence Ministry had announced that 25 soldiers were injured and seven others were missing following an unexplained accident yesterday during the firing of heavy weapons ammunition. </span><br />'' <br />'' <span style="color: #222222;">The blast occurred at a base in Hakkari province, bordering Iraq and Iran. The base is used to combat Kurdish rebels. It wasn't clear if the explosion occurred during training or a clash against rebels.</span><br />