Mumbai Port Trust (MbPT) has appointed SMIT Salvage, a Netherlands-based company to control the oil-spill caused due to a collision between two cargo ships off the Mumbai coast, a senior port official said. Currently, the company is working hard with 11 vessels to look after the operation there, the official said. "We have appointed SMIT Salvage to look after the oil-spill. The company is working there with 11 off-shore vessels out of which six vessels they received from Mumbai-based Great Offshore Limited," the port official said. Meanwhile, Directorate General of Shipping's Chief Nautical Advisor, Mr M.M. Saggi, said the anti-pollution operation by the Coast Guard is still on. Anti-pollution disposal spray systems are on the job. All coastal districts of Maharashtra are on high alert as the oil slick has spread to the Alibaug and Uran areas, and also close to Elephanta caves. Concerns are that it may also affect the mangrove belt along the coastline. The Coast Guard has said it will be tough to contain the oil-spill because of tidal conditions.