Experts are pulling out all the stops to make sure a Chinese fuel slick does not cause grief in a Russian city. Dams along the Amur river near the two countries’ border are being built up, while containers and sacks full of special charcoal are being dumped into the water to neutralise the pollution. The slick of benzene, caused after a factory explosion in China, spread along the Songhua river and into the Amur. Experts say the fuel is now just 30 kilometres away from the city of Khabarovsk, which has a population of 600,000.Officials say millions of litres of water have been brought into the city to make sure there is a drinking supply if the cleaning efforts in the river do not work. China offered assistance to Russia after the pollution – with relief supplies and expertise – and made an official apology. The environment minister in Beijing was also forced to resign over the affair.