Indian police have arrested two men under suspicion of supplying mobile phone cards used by the Mumbai attackers to keep in touch.
Police say the two Indian men were picked up on Friday in the Eastern city of Calcutta.
New Delhi has blamed Islamic militants from neighbouring Pakistan for the three day rampage in India’s financial capital.
With India still reeling from last weeks attacks, police also confirmed finding explosives in a hospital in the city of Nagpur after doctors received a call warning of a bomb.
At least 171 people were killed in the terrorist attacks in which 10 gunmen struck two luxury hotels and other landmarks in Mumbai.
With Indian authorities coming in for heavy criticism for failing to prevent the killing spree, the country’s forces remain on high alert, with increased security at most major airports.