The Narcotics Control Bureau's Mumbai zonal unit has busted an inter-state drug syndicate and seized mephedrone worth Rs 4.5 crore from neighbouring Thane district in Maharashtra, an NCB official on Monday.

The syndicate's kingpin and two other persons were arrested following the drug seizure on Sunday, he said, adding that Rs 36 lakh in cash and gold worth Rs 7.8 lakh were also seized.