There has been an outbreak of cholera¹ in the world's largest refugee camp in Kenya, home to Somalis fleeing famine and conflict, the UN has said.

联合国称，位于肯尼亚的世界上最大的难民营——逃避饥荒和战乱的索马里人的家——爆发霍乱。

It may have started among new arrivals at the camp where one person has died and there are now 60 cases, it says.

The aid operation at Dadaab camp was scaled back last month after the abduction（诱拐，绑架） of two aid workers.

Kenya blames Somali Islamist militants² for the kidnappings and has sent troops into Somalia in pursuit of them.

But the al-Shabab group, which controls most of central and southern Somalia, denies it is behind the abductions.

Nearly half a million people have fled Somalia to seek assistance in Dadaab over the last two decades.

Rains and flooding

The UNHCR refugee agency says insecurity is still hampering³ aid efforts in the area, despite the deployment⁴ of 100 Kenyan policemen in the last month.

It says the situation has been exacerbated⁵（加重，恶化） by the outbreak of the waterborne disease.

The UNHCR and other aid agencies have set up cholera treatment centres in the camp for severe cases.

"Rains and flooding had affected⁶ the trucking of water to parts of the camps, and we fear some refugees resorted to using unsafe water from flooded areas," the UNHCR said in a statement.

The drought in East Africa is the worst in 60 years, with Somalia worst affected.

Some areas have been declared famine zones, and many thousands have fleeing their homes to seek assistance over the borders.

Kenya's incursion（入侵） has contributed to a slowing in flow of Somalis to Dadaab, but many are still arriving in Ethiopia.

A fifth refugee camp is being set up in Ethiopia and more than 7,600 recent arrivals from Somalia are now encamped at the transit⁷ centre, the UN said

Two Spanish women working for the medical charity Medecins Sans Frontieres (MSF) in Dadaab were kidnapped in October.

Other abductions include a Kenyan driver also seized from Dadaab, a British woman taken from a coastal⁸ resort and a French woman who suffered from cancer.