The United Nations raised the alarm on Tuesday over fighting raging near the former safe haven of Wad Madani in Sudan where the population had swelled to more than 700,000. The paramilitary Rapid Support Forces on Sunday set up a base near Wad Madani, where their offensive has sent thousands fleeing Sudan’s second city and former aid hub, many of them already displaced. The paramilitaries have continued to press deeper into the city, witnesses say. UN Secretary General Antonio Guterres “is deeply concerned about reports of fighting between the Sudanese armed forces and the Rapid Support Forces…