The National Committee on the Protection of Oil, Gas and Mineral Resources, Power and Ports claims there is a plot to build a commercial area in the world’s largest mangrove forest.
At a press call on Monday, the committee's Member Secretary Anu Mohammad said the government was yet to form an expert panel on the spill.
An oil tanker transporting over 350,000 litres of furnace oil sank in the Shela River on Dec 9 after being hit by another vessel.
Environmentalists fear the oil slick will endanger ecology of the delicate forest.
"No initiative has been taken to remove the oil," Anu Mohammad claimed.
The local administration has been using help of local residents to mop up the oil and the government is buying them back at Tk 30 per litre.
Prime Minister Sheikh Hasina on Monday ordered the reopening the Ghashiakhali Channel, once used as an India-Bangladesh water protocol route and maritime communication route for the country's southern region.
It was closed nearly three years ago after Mongla's Nala River and Rampal's Kumar River filled up.
Since then BIWTA has been using the Shela River inside the Sundarbans as an alternative route.