New Delhi, July 12 - The collapse of an under-construction Delhi Metro bridge in south Delhi that killed five people Sunday is the worst accident so far involving the mass transport system in the national capital.

Following is an accident time-line of Delhi Metro in recent times:

July 12, 2009: Portion of an under construction bridge collapsed when its launching girder lost balance as it was being erected at Zamroodpur, near East of Kailash, on the Central Secretariat-Badarpur corridor slated to be opened September 2010. Five people were killed and 15 others injured.

Oct 19, 2008: An under construction flyover collapsed in Laxmi Nagar of east Delhi due to mechanical failure leading to the death of at least two people. Nearly 30 people were injured. One Blueline bus, one truck, one crane, and a few private cars were damaged.

Sep 30, 2008: A prisoner was injured after he got dragged by a Metro train across the length of the Chandni Chowk platform. The prisoner Joginder, 35, was tied to another prisoner with a rope and was escorted by three policemen. He seemed to have got off the train but his partner remained inside the coach.

The otherwise sensitive doors of the metro train shut and the train began to move with the rope stuck between the doors.