An Iranian boat with a huge consignment of heroin was apprehended in Indian waters off the Gujarat coast, in an operation carried out jointly by the state Anti-Terrorist Squad and the Coast Guard, officials said on Sunday.

"On an intelligence based joint act, @IndianCoastGuard with ATS #Gujarat apprehended #Iranian boat in #Indian waters with 7 crew carrying #drugs. The boat is brought to the nearest port for further rummaging and investigations," a defence spokesperson in Gujarat said on their Twitter handle.

The boat, seized during the operation conducted on Saturday night, carried an estimated 30 to 50 kg of the contraband, worth about ₹ 150 to ₹ 250 crore in the international market, but the exact amount of the drug present in the vessel will be known after its rummaging, they said.

The seven crew members, all Iranian nationals, have been arrested.