Finance secretary denies material is subject to import duties, as police stop private aid trucks and state orders all overseas money to be paid into its fundThe Nepali government is increasingly under fire for blocking private initiatives bringing desperately needed assistance to remote areas, and allegedly obstructing the flow of relief to the country.Suman Prasad Sharma, the Nepali finance secretary, on Saturday denied charges made by NGOs and top international officials that the government was levying import taxes on aid or had blocked consignments.