Indian coast guard vessels and helicopters worked Monday to contain oil spilling from a stricken container ship that collided with another vessel in the Arabian Sea, India’s defense ministry said.

The Panamanian-registered MSC Chitra smashed into the St. Kitts-registered MV-Khalijia-II on Saturday near Mumbai’s Jawahar Lal Nehru port. The accident caused the MSC Chitra to run aground and list heavily, ministry spokesman Capt. Manohar Nambiar told The Associated Press.

At least 250 containers from the damaged vessel fell off and port officials were trying to salvage them to avoid navigational hazards to other ships, officials said.