Nigeria: UN chief 'appalled' by killing of aid worker; calls for release of remaining hostages.

The United Nations Secretary-General strongly condemned on Tuesday the killing of an aid worker from the International Committee of the Red Cross (ICRC) in north-east Nigeria. He said he was 'appalled' by her death on Monday.

The aid worker, Hauwa Mohammed Liman, a 24-year-old midwife and nurse had been working in the town of Rann, near the border with Cameroon. She was abducted on 1 March, along with two other nurses, Saifura Hussaini Ahmed Khorsa and Alice Loksha, following an attack on the town by armed extremists, in which dozens were killed.

The Secretary-General expressed his deepest condolences to the family, friends and colleagues of Ms. Liman and his solidarity with ICRC staff. 'Those responsible for this killing must be brought to justice,' he stated.

Among the casualties of the 1 March attack in Rann, were three UN aid workers: Emmanuel Yawe Sonter and Ibrahim Lawan who worked with the International Organization for Migration (IOM) and Dr. Izuogu Onyedikachi who worked with the UN Children's Fund (UNICEF).

Saifura Hussaini Ahmed Khorsa, one of the other two abducted nurses, who also worked with ICRC, was killed a month ago after spending six and a half months in captivity, in what the UN Humanitarian Coordinator for Nigeria called a 'cowardly, heinous and despicable act'.

According to news reports, Alice Loksha, who worked with...