NAIROBI, Kenya (AP) — The number of aid workers kidnapped in South Sudan has more than doubled this year, according to two senior humanitarian officials working for international groups.

Aid agencies are concerned about the well-being of their staff and the disruption of their life-saving services in a region suffering one of the most severe humanitarian crises.

Several of those kidnapped have been released after ransom payments, said three people with knowledge of the negotiations, but one aid worker died in captivity earlier this month, according to several sources familiar with the incident, including Edmund Yakani, a prominent civil rights activist in the country.

The United Nations has long designated South Sudan as one of the most dangerous places for aid workers. However, analyst

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