New Delhi, Jan. 28 -- Colombia on Tuesday blasted Ecuador's decision to hike up transportation fees for Colombian oil, calling the move an act of "aggression," as a trade war between the two Andean nations intensifies.

Ecuador announced Monday a tenfold increase in fees for Colombian companies using its oil pipelines, raising the rate from $3 to $30 per barrel. The move would make it harder for oil companies in Colombia to use a pipeline that takes oil from western Ecuador and southwestern Colombia to ports along the Pacific Ocean.

One of the companies that will most likely be affected is Colombia's state-run Ecopetrol, which uses the pipeline to move more than 12,000 barrels of oil per day.

"This is a new aggression against the people...