Guwahati, Apr 8 (PTI) Heroin worth Rs 16 crore was seized and four people were arrested in Assam"s Karimganj district, police said on Friday.Acting on a tip-off, a vehicle was intercepted in Ishanchora village in Ramkrishna Nagar police station area and 2.27 kg heroin was seized from it, they said.The drugs were packed in 175 soap cases and hidden in a compartment of the vehicle, they said.Four people were arrested in the operation that began on Thursday and continued till the early hours of Friday, Superintendent of Police Padmanabh Barua said.A case was registered under relevant sections of the NDPS Act, he said.Congratulating the police, Chief Minister Himanta Biswa Sarma tweeted, "Another breakthrough in Assam Police"s drive against drugs. In a day-long operation, Karimganj police seized 2.275 kg of heroin packed in 175 soap cases. Four accused apprehended." PTI DG SOM SOM