Mumbai: In perhaps the biggest haul of the synthetic stimulant drug Mephedrone in the metropolis, the Maharashtra Anti-Terrorist Squad (ATS) on Tuesday claims to have seized 151.5 kgs of the contraband worth Rs 30 crore from a hotel in suburban Oshiwara and arrested four persons.

"We have seized 151.5 kgs of Mephedrone, also known as MD and meow meow, worth Rs 30 crore from Oshiwara," an ATS official said.