JAKARTA (Reuters) - Authorities in Indonesia were scrambling on Tuesday to rescue about 140 passengers from a ferry that sank off the coast of Sulawesi island, killing at least four, officials said.

The disaster comes in the wake of last month's sinking of an overcrowded ferry on the southeast Asian nation's Lake Toba, one of the world's deepest volcanic lakes, which took about 200 lives.(For a graphic on the Lake Toba tragedy click tmsnrt.rs/2tJRon2)

At least four people were confirmed dead in Tuesday’s incident, the chief of South Sulawesi’s Selayar regency told broadcaster TVOne.

There were also vehicles on board the ferry when it filled with water and sank, media said. The vessel was close to shore at the time.

It was unclear how many people had been rescued, and television images showed dozens of passengers hanging on to the keeling vessel or bobbing in the water wearing life jackets.

Indonesia suffers frequent boat sinkings, with basic safety rules often flouted and vessels overloaded.

After last month’s sinking, one of the deadliest in nearly a decade, a two-week search and rescue effort located the vessel at a depth of 450 m (1,500 ft) with victims trapped inside, but technical and logistical challenges forced the recovery to be called off.