Mediators Saudi Arabia and the United States have announced that Sudan's warring sides have agreed to a nationwide ceasefire for 24 hours starting early on Saturday.  Saudi Arabia's foreign ministry said in a Twitter post that the ceasefire will begin at 6 am local time.  The agreement marks the latest in several failed attempts to stop weeks of fighting between the Sudanese army and the Rapid Support Forces (RSF) paramilitary group.<br />''  <br />'' The ministry's statement said the two sides agreed to refrain from seeking military advantage during the 24-hour period, as well as from prohibited movements, attacks, use of aircraft or drones, aerial bombardment, artillery strikes, reinforcement of positions and resupply of forces. They also agreed to allow the unimpeded movement and delivery of humanitarian assistance throughout the country, it added.