An international think tank has accused Sudan’s ruling party of trying to rig elections in war-torn Darfur region, as the country prepares for its first multi-party polls in 24 years. The International Crisis Group said voter registers for the April 11 to 18 polls had been manipulated, constituencies based on a flawed 2008 census and the election commission staffed with too many pro-government officials, in a report released late on Tuesday.