NAIROBI, KENYA, JULY 8 -- Three Americans and a Briton were abducted from their homes in southern Sudan by armed men identifying themselves as Sudanese rebels, a relief official said today.

The men said they were members of the Sudan People's Liberation Army, according to Dan Bitrus, executive director of the Nairobi-based Association of Christian Resource Organizations Serving Sudan (ACROSS).

Bitrus said the kidnaping occurred between 12:30 a.m. and 2 a.m. yesterday in Mundri, in southern Sudan.

"We do not know where they were taken," said Bitrus.

Bitrus said three of the victims, two American teachers and a British nurse, worked under the auspices of ACROSS, a consortium of Christian missions that has been working in Sudan since 1972.

He identified them as Steve Anderson, of Minneapolis; Katherine Taylor, of Johnson City, Tenn.; and British nurse Heather Sinclair.

Bitrus identified the fourth victim as Mark Nikkel, an American Episcopal priest not associated with the relief organization.

Bitrus said Anderson and Taylor were teachers at the Bishop Gwynne College, which is run by the Episcopal Church of Sudan.

The U.S. Embassy in Khartoum said it had received reports of the kidnaping but did not know the identities of the abductors. It would not confirm the identities of the victims.