Bangladesh has tightened security in the capital, Dhaka, adding night surveillance and checkpoints after several unconnected cocktail explosions and arson incidents were reported across different parts of the country in the last few days. Dhaka [Bangladesh], November 11 (ANI): Bangladesh has tightened security in the capital, Dhaka, adding night surveillance and checkpoints after several unconnected cocktail explosions and arson incidents were reported across different parts of the country in the last few.