The Sri Lankan navy on Tuesday rescued all 25 crew members, including two Indians, of a container ship that caught fire off the coast of Colombo last week.

Both Indians, who are yet to be identified, have sustained serious injuries during the rescue operation and were admitted to the Colombo National Hospital, according to media reports.

On May 20, container vessel MV X-PRESS PEARL, carrying a consignment of chemicals and raw materials for cosmetics from Hazira in Gujarat to Colombo Port, caught fire 9.5 nautical miles from the Colombo coast here where it was anchored, officials said.

Intermittent extinguishing operations were conducted by the navy, Ports Authority and Marine Environment Protection Authority and the fire was believed to be doused.

However, a loud explosion was heard on Tuesday morning, possibly in the sub sections of the vessel where a load of nitric acid is stored, officials said. The Sri Lankan Air Force was pressed into service with a Bell-212 helicopter.

All 25 crew members — of Philippine, Chinese, Indian and Russian nationality — were rescued, they said. The Colombo Gazette newspaper said both Indians sustained serious injuries.

The Lankan navy said efforts are underway to completely extinguish the flame. Eight cargo containers fell into the sea during the operations, officials said. Tug boats have been deployed to reduce the heat surrounding the container, the navy said. Two offshore vessels and a fast attack craft are using dry chemical powder to contain the fire.