A bomb strapped to a bicycle exploded near a busy bus terminal in Afghanistan, killing eight people Tuesday as the death toll of US troops in the Afghan war surpassed the grim milestone of 1,000. The attack happened in Lashkar Gah, capital of Helmand province where a massive US-led military offensive against the Taliban entered a tenth day and US defence chiefs said progress was slower than expected. Sixteen people were also injured in the blast, the interior ministry said. The Helmand assault by 15,000 US troops, dubbed Operation Mushtarak -- meaning "together" in the Dari Persian dialect spoken in Afghanistan -- aims to push the Taliban out of the Marjah and Nad Ali areas under their control. But the chairman of the US Joint Chiefs of Staff, Admiral Mike Mullen, said in Washington progress against Taliban fighters in the target areas was "steady if perhaps a bit slower than anticipated".