The CPI - M on Saturday demanded a time - bound independent inquiry into the causes of the flyover collapse in Kolkata which killed 26 people.
In a statement, the Communist Party of India - Marxist (CPI - M) politburo expressed its deep grief at the loss of life and grievous injuries caused by the collapse of the under - construction flyover.
It said that the party and its mass organisations have been actively involved in providing relief to the victims and a blood donation camp was organised to provide fresh blood to those injured and languishing in the hospitals.
"There are now reports in the media indicating a nexus between the ruling Trinamool Congress and the sub - contractors who were assigned various works in connection with construction of this flyover.
"It has now become imperative that there should be a time - bound high level independent enquiry into the causes of this tragedy. This is necessary to establish the culpability and, on that basis, to punish the guilty, " the statement said.
The party said that investigation should be conducted immediately by an independent inquiry committee.
West Bengal Police have arrested three officials of the joint venture company - - Hyderabad - based IVRCL Infrastructure - - which was executing the flyover project.
A 23 - member special investigation team (SIT) has been set up to probe the disaster.