On 15 July, all 200,000 residents of Liège, the third-largest urban area in Belgium, were urged to evacuate amidst fears that the River Maas could burst its banks and that a dam bridge could collapse.[11][2][12] As of 15 July, no vehicles were allowed into the city centre of Liège, traffic was only allowed to leave as part of the evacuation.[13] In addition, due to the heavy flooding, a number of municipalities in Liège and Namur provinces were left without potable tap water.[14] All train services in the Wallonia region were suspended.[15]