Four persons, including two jail inmates, were arrested for running an inter-state pharmaceutical drug cartel from a prison, police said on Tuesday.

As many as 5.31 lakh pharma opioids were also recovered from their possession, they said.

Those arrested have been identified as Sunny Kumar of Ludhiana and Ranjit Singh alias Rinku of Ludhiana, while, Eshaan Gupta and Ravi Kumar were brought on production warrant from Central Jail Ludhiana, Deputy Inspector General of Police, Ropar Range, Gurpreet Singh Bhullar said.