Mumbai, Aug. 14 -- The Colaba police have registered a case against four fake police personnel who allegedly extorted foreign currency worth Rs.1.56 lakh in Dirhams and US Dollars from an Omani family in Colaba by threatening to arrest them in a drug trafficking case. Police officials said the fake policemen searched the woman's bag first and then took away the foreign currency. The complainant, Oman national Abdulla Ahmed Alblushi, 41, arrived in India on August 10 along with his wife and elderly parents and stayed at Gulf Hotel in Colaba....