Bangladesh Nationalist Party (BNP) acting chairman Tarique Rahman on Thursday called on countrymen to join hands to maintain law and order, in his first address to party supporters hours after his arrival in Dhaka after a gap of 17 years. Whatever political party we belong to, whatever religion we believe in, whether we are non-partisan individuals -- all must join hands to maintain law and order, he told thousands of party supporters gathered at the July 36 Expressway in the capital, where he went straight after arriving at the airport. Rahman's call for maintaining law and order came amid a fresh wave of unrest and political instability gripping Bangladesh following the killing of prominent youth leader Sharif Osman Hadi, who was a prominent face in last year's mass protests that forced the collapse of the Sheikh Hasina government. Rahman, the 60-year-old son of ailing former prime minister Khaleda Zia, has emerged as a leading contender for prime ministership in the ...