AMSTERDAM (Reuters) -Around 300 climate activists were held by police in Amsterdam on Saturday for blocking a major highway in the Dutch capital for several hours to demand an immediate end to the financing of fossil fuel projects by the country’s largest bank, ING. Hundreds of activists walked onto the A10 highway to the south of the city at about noon (1100 GMT), police said, after road authorities had shut the road down to avoid casualties. Organised by the Extinction Rebellion group, the protest took place at the site of the former headquarters of ING, which the climate activists said is t…