Two persons were killed in a building collapse at Chennai today. Eight families are said to be residing in the fifty year old two storey building. The Fire personnel found it difficult to reach the street since it was too narrow to bring in the JPC trucks which are used to clear the rubble. Sniffer dogs and fire personnel are involved in tracing out those who are still trapped. Ambulances have also been parked outside the accident site to carry the injured to the hospital.