At least 163 people died when a ferry capsized off the popular tourist archipelago of Zanzibar, but over 100 people are still missing, a minister said on Saturday.

“We have recovered 163 people who have died and we have rescued 325 survivors,” said Mohammed Aboud, Zanzibar’s state minister for emergencies, dramatically updating an earlier death toll of 53.

At least 40 of those rescued were seriously injured, including some hit by falling debris as the boat rolled onto one side, he said, adding that the death toll could still rise higher.

Officials said that around 600 people were believed to have been on the stricken ferry, including families returning home after the holidays to celebrate the end of the Muslim holy month of Ramadan.

Survivors have begun arriving back in Stone Town, the main port and capital of the archipelago, with an emergency first aid centre set up in the port to treat those arriving by rescue speed boat from the capsized ferry.