( CNN ) -- A small overcrowded boat sank off the coast of Malaysia early Thursday , a maritime official said . It 's the second boat to go down in two days . Eighteen passengers have been rescued , and the search continues for nine others who are missing . The boat was carrying 27 Indonesian migrants , who were heading back home to Sumatra for the Ramadan holidays , Capt . Hamid Mohd Amin with the Malaysian Maritime Enforcement Agency said . Another boat carrying 97 Indonesians sank in waters off Malaysia 's west coast Wednesday , Indonesian authorities said . More than 30 people were missing . The vessel , reportedly carrying undocumented migrant workers heading for Aceh in Indonesia , capsized after leaving Carey Island in Malaysia 's Selangor state on Wednesday morning , the Indonesian Ministry of Foreign Affairs told CNN . Malaysian Maritime Enforcement Agency said 60 people have been rescued , and five bodies have been recovered .
Both boats sink in 10 minutes off the Malaysian coast . Both were carrying Indonesian migrants . Rescue operations are underway .