Siege of Khartoum stores dwindled and starvation began to set in for both the garrison and the civilian population. Communication was kept through couriers while Gordon also kept in contact with the Mahdi, who rejected his offers of peace and to lift the siege. On 16 September an expedition sent from Khartoum to Sennar was defeated by the Mahdists, which resulted in the death of over 800 garrison troops at Al Aylafuh. By the end of the month, the Mahdi moved the bulk of his army to Khartoum, more than doubling the number already besieging it. As of 10 September 1884, the civilian
Khartoum Bridge (finished in October 2007) and the Tuti Bridge that links Khartoum to Tuti Island. In the 21st century, Khartoum developed based on Sudan's oil wealth (although the independence of South Sudan in 2011 affected the economy of Sudan negatively). The center of the city has tree-lined streets. Khartoum has the highest concentration of economic activity in the country. This has changed as major economic developments take place in other parts of the country, like oil exploration in the South, the Giad Industrial Complex in Al Jazirah state and White Nile Sugar Project in Central Sudan, and the Merowe Dam