 On 19 October 2008 , a girder launcher and a part of the overhead Blue Line extension under construction in Laxmi Nagar , East Delhi collapsed and fell on passing vehicles underneath . Workers were using a crane to lift a 400 @-@ tonne concrete span of the bridge when the launcher collapsed along with a 34 @-@ metre ( 112 ft ) long span of the bridge on top of a Blueline bus killing the driver and a labourer . 
