Thane, Oct. 31 -- The Mumbra police have arrested four foreign nationals, including three Tanzanian and one Nigerian citizen, after allegedly recovering 1.498 kg of mephedrone (MD), valued at Rs.1.50 crore in the illicit market, from their flat in Samrat Nagar. The arrests are among seven made in three separate NDPS cases in Mumbra over the past 12 days, with the police investigating whether the four foreign nationals were part of a larger international drug trafficking network. Acting on a tip-off about suspicious activities by foreign nationals staying in Hari Om building at Samrat Nagar, a police team led by assistant police inspector Vinayak Mane raided their flat on Wednesday. The police seized 1.146 kg of white-brown MD and 352.5 gm of brown MD, along with mobile phones and electronic weighing scales. The total value of the seized narcotics was estimated at Rs.1.50 crore in the illicit market. The accused have been identified as Rashid Muzammil Saeed, Hasan Nyumbe Ali, 34, and Kevin Adolf Wosa, 26, all Tanzanian nationals, and Obiali Alex Zender Chidibere, 34, a Nigerian national. All four were residing in the building. Balasaheb Patil, deputy commissioner of police, Zone 1, said the police were verifying the accused's entry into India, the validity of their passports and visas, and the purpose of their stay. "We are also checking whether any criminal cases are registered against them in other parts of the country," Patil told HT....