Maritime authorities said a search and rescue attempt was underway for 25 Indonesians who went missing when a boat collapsed off the coast of Malaysia on Wednesday, killing 11 people, including suspected unauthorized migrants.

Among the estimated 50 persons on board, 14 were reported safe when the boat capsized in bad weather off the coast of Johor state at 4:30 am (2030 GMT).

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According to the Malaysian Maritime Enforcement Agency (MMEA), survivors and the boat were discovered on a beach in Tanjung Balau.

Captain Simon Templer Lo Ak Tusa, Johor marine operations deputy director, told reporters, “The boat was believed to have travelled from Indonesia and capsized after being hit by strong waves.”

According to the MMEA, all of the migrants engaged were Indonesian.

The Indonesian consulate in Johor announced in a statement that its representatives were on the scene to assist with the identification and management of the victims’ remains.

The incident is the most recent in a series of disasters in the Indonesian-Malaysian waterways in recent years, most of which involved overloaded boats transporting labourers seeking work in Malaysian factories and plantations.

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According to Anis Hidayah of Migrant CARE, a Jakarta-based non-governmental organisation, between 100,000 and 200,000 Indonesians travel illegally to Malaysia for employment each year, many of whom are recruited by human trafficking gangs and exploited once they arrive.

She told Reuters, “They travel to Malaysia by boat and there are so many accidents because they depart at night and arrive early in the morning,” adding that boats frequently stop before reaching land to avoid detection, forcing those on board to swim ashore.

Simon encouraged migrants not to take such dangerous treks. “We would like to advise people, especially the undocumented migrants, … to use valid routes to prevent such incidents from recurring,” he said.