At least one person died and 19 others were horrifically wounded in an explosion on a tourist boat between the Indonesian islands of Bali and Lombok.
It is not known what caused the blast, but police say they do not believe it was a bomb.
The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.
Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
Indonesia has "a poor maritime safety record", notes the broadcaster. Some reports say a battery may have short-circuited above a fuel tank, causing it to blow up.
The Gili Cat 2 boat was carrying at least 30 passengers – all of them foreigners – and four crew when the incident happened just 200m into its journey to the island of Gili Trawangan.
A passenger document shows there were tourists from the UK, France, Italy, Portugal, Ireland and Spain on board.
Photographs of badly-injured victims being carried ashore have been widely shared on social media.
Police chief Sugeng Sudarso said the victims were being taken to a clinic in Manggis Village. "Many victims [are] injured, mostly foreigners. One female passenger died from head injuries," he said.
"We are still investigating the cause of the explosion – whether there is any element of intent or negligence."
A Foreign Office spokesperson said: "We are providing consular assistance to British nationals affected by an explosion on a ferry off the coast of Bali."