A land-based pipeline leak has led to about 30-40 metric tons of “slop” — a mixture of oil and water — being spilled into the sea off Singapore, Shell Plc said in a statement today.

Shell said it is “actively working with all relevant authorities to manage the clean-up effort” and to ensure the safety of people as well as limit the environmental impact.

The company has deployed containment booms, anti-pollution crafts and spraying of dispersant to contain and break up the oil. The leak occurred between Bukom Island and Bukom Kecil at 5:30 a.m. Sunday.

READ: Shell Pipeline in Singapore Reported Oil Leak Early Sunday

The Maritime and Port Authority of Singapore has deployed a current buster system off Changi at the entrance to the East Johor Strait to collect oil slick, if sighted, according to a joint media statement from government agencies. Other precautionary measures have been taken to prevent a potential spread.

Authorities have advised the public against swimming and conducting other primary contact water activities at some beaches. There were no other oil sightings as of 3 p.m. Singapore time.