Heroin worth Rs 50 crore was seized from Malda district by the Calcutta police hours before it was to be smuggled into the city, officers of STF said on Sunday.

The seizure came following the arrest of two men — who were caught in Mominpur two days ago allegedly carrying a huge consignment of yaba tablets, also called “happy pills”.

STF officers said Mohammad Esmail Sheikh and Abhishek Salam were arrested in on August 12 for allegedly possessing Amphetamine tablets, commonly known as yaba tablets.

Drugs weighing around 2.291kg, worth Rs 5 crore, were seized, police said.

A court sent the duo to 14 days’ police custody.

“During their remand we learned that a heroin consignment was headed for Calcutta,” said a senior police officer.

Based on the input, cops arrested two more men near Adina Morh, Gazole, on Sunday and seized about 10.068 kg of heroin worth Rs 50 crores.

The accused were identified as Lalit Shahani and Sumit Ali Patra.