Collapsed sewer hits Glasgow city centre 7 February 2013 Last updated at 14:18 A collapsed disused sewer and burst water main have caused the partial closure of two of the busiest streets in Glasgow city centre. Scottish Water said Nelson Mandela Place and West George Street - between West Nile Street and George Square - would be affected for about two weeks. They will be closed to all traffic - except taxis and service vehicles - while remedial work takes place. The collapsed sewer has caused some subsidence near Queen Street Station. Patience and understanding The problems were discovered during work to upgrade city centre water mains. Mark Maclaren, Scottish Water's regional community manager, said: "Following our investigations, this additional extension of the road closure is required to enable us to repair the burst water main and the collapsed sewer and carry out reinstatement work. We would like to apologise for the inconvenience and disruption this work is causing road-users, customers and businesses. We greatly appreciate their patience and understanding. Because the burst water main and sewer collapse occurred while we were carrying out our water mains upgrade in Nelson Mandela Place and West George Street we were able to respond quickly, investigate and establish the cause of the subsidence and start the necessary repair work. The £3.5m programme of water mains upgrade started in July 2012 and is aimed at reducing the risks of bursts in the busy city centre area.