Three persons were arrested for alleged possession of mephedrone powder worth Rs 2.5 crore in Navi Mumbai, police said.

The Anti-Narcotics Cell of the Navi Mumbai police also unearthed a factory manufacturing mephedrone powder at Poynad of Alibaug, police chief Bipin Kumar Singh said. The police on Thursday arrested Karim Rafique Khamkar (39), Zaki Afroz Pittu (33) and Subash Raghupati Patil (40), he said. Khamkar was first nabbed with mephedrone powder, which he was carrying for sale, the official said.