Numerous new arrivals are Rohingya Muslims who had walked for up to 14 days, carrying their children and whatever they could pack at short notice.
Soldiers and Buddhist mobs had torched his village, he said. "I can't find my relatives ..."
"These people lack most of the basic services - toilets, water sanitation and everything", UNICEF spokesman A M Sakil Faizullah told AFP.
"Clearly we have to be prepared for more arrivals".
The worlds second largest oral cholera vaccination campaign has been launched in the refugee camps of Bangladeshs Coxs Bazar to protect the Rohingyas and host communities from infection, the World Health Organization said today.
Authorities in Bangladesh said the boat was carrying between 60 and 100 people when it overturned and sank late Sunday in rough seas.
"We made a makeshift arrangement for shifting them to an island called "Bhasan Char" from Cox's Bazar. we need global community's assistance including that of the United Kingdom for their relocation", she said.
Hossain's mother, his pregnant wife and two children were all still missing.
More than half of the victims in the latest disaster were children, said Mian Uddin, police chief for the border town of Teknaf.
Both the European Union and the United States have considered imposing sanctions on Myanmar military leaders.
European Union foreign ministers will discuss the situation in Myanmar on 16 October, and their draft joint statement said the bloc "will suspend invitations to the commander-in-chief of the Myanmar/Burma armed forces and other senior military officers".
Such a move would be largely symbolic, but could be followed by further action.
"We have also asked the government to train and arm the Rohingya so that they can liberate their homeland", he said.
"Nobody wants another emergency within this existing emergency that we are facing with the Rohingya refugees here".
The World Food Programme (WFP) said the cuts were temporary and due to delays in receiving payments.
"The situation's getting worse". In 1982, a controversial law stripped citizenship from the Rohingya, officially making them stateless. He said a lot of people were preparing to flee.
With support from the World Health Organization and the United Nations Children's Fund, Bangladesh's Ministry of Health rolled out an ambitious oral cholera vaccination campaign on Tuesday at numerous Rohingya Refugee Camps sites in the Cox's Bazar sub-districts of Ukhia and Tekhnaf.
The insurgents declared a one-month ceasefire from September 10 to enable the delivery of aid but the government rebuffed them, saying it did not negotiate with "terrorists".
The UN says more than 600,000 have arrived in the a year ago, swelling camps that were already home to between 300,000 and 400,000 refugees.
In 1992, Bangladesh signed a repatriation agreement with the then Myanmar's military regime, following which 236,599 Rohingyas returned to their homeland.
The chairman of the USA bishops' Committee on Migration called on the federal government to work with the Myanmar government and the worldwide community to solve the crisis affecting the persecuted Rohingya people. A lot of them were coming from the Rakhine state of Myanmar, a far away place from the border of Bangladesh.
The family had walked for several days from Buthidaung to reach the riverbank, where hundreds more Rohingya were waiting to escape.