THIRUVANANTHAPURAM: Congress leader Rahul Gandhi on Tuesday alleged that there is a secret understanding between the central government and the CPI(M)-led LDF government and claimed that the investigation in the gold smuggling case was moving slowly.

"There is this one thing that I cannot understand. Why is it that the cases against the Left government, against a person who works in the Kerala CMO, are progressing slowly? Why is it taking so long? Why are agencies like CBI and ED not attacking the Left government? When you fight the BJP, the BJP attacks you all the time," he said.