Dar es Salam (Alshahid)-At least 30 people, including European tourists, have perished and more than 100 remain missing after a ferry capsized off the coast of Zanzibar on Wednesday, according to Tanzanian Red Cross.

Rescuers plucked at least 150 people from the choppy waters before they postponed the search at nightfall Wednesday, said Raymond Kanyambo, a spokesman for the Tanzanian Red Cross.

It is unclear how many passengers were onboard, but the ferry has a capacity of about 250 people, he said.

The Zanzibar bound boat left Dar es Salam Wednesday at 12 noon but overturned on Zanzibar Channel at around 1.55 pm according to the Dar port control room.

Mohamed Shein, president of the semi-autonomous Zanzibar archipelago has declared three days of mourning.

Last September, more than 200 people were killed when a crowded ferry traveling between two islands of Zanzibar sank off the East African coast. Officials described it then as the worst accident in Tanzania’s maritime history.