The Foreign Office has said it will send a final plane to collect British nationals, amid violence in South Sudan.
Seven UN peacekeepers have been killed in Sudan's Darfur region in the deadliest ever attack on the force, the UN mission has said.
A top tribal leader allied to South Sudan was killed in clashes involving a rival Sudanese tribe in the Abyei region disputed by the African neighbours both sides said,.
The incident risks fuelling new tensions in the flashpoint area.
Abyei, straddling the border between Sudan and South Sudan, is claimed by both sides, which fought one of Africa's longest civil wars.
In March, both countries agreed to resume cross-border oil flows and defuse tensions which have plagued them since South Sudan's secession in 2011.
Kuwal Deng Mayok, the top Dinka leader in Abyei, was killed by members of the Misseriya, another Dinka leader told Reuters, asking not to be named.
Britain will give at least £33 million in aid to Darfur as part of a £67 million package of support for Sudan, the Department for International Development has announced.
The money will ensure 1.7 million people a year in Darfur have access to safe water and sanitation and 1.5 million people are given emergency food supplies, the Government said.
International Development Minister Lynne Featherstone said: "Our aid will help the poorest to get the help they need to stand on their own and make them better able to cope when crises occur."
An international donors conference is being held in Doha today for the development of Sudan's western region, which has been riven by violent conflict for a decade.
Almost half of Darfur's population depend on emergency relief and nearly two million remain displaced since the conflict began in 2003.
A site containing more than 35 small pyramids has been discovered in Sudan.
The structures are thought to be around 2,000 years old when the area, then known as the Kush kingdom, bordered Egypt.
Researchers are surprised at the density of the pyramids and the unusual circular structure at their centre.
A man who was part of a group of immigrants who lured local schoolgirls to a house for sex cannot be deported because he is a member of a "persecuted tribe", the High Court heard today.
Jumaa Kater Saleh, now aged 24, went to court in a bid to claim damages for unlawful detention during the government's failed bid to send him back to Sudan.
He was convicted of having sexual activity with a female under 16 in 2008.
High Court judge Philip Mott QC said that Saleh was a member of the 'Zaghawa' tribe in the Sudan, which was subject to widespread persecution, so he could not be deported.
Judge Mott rejected the application for damages saying his case failed "on all grounds".
A UN peacekeeping helicopter on a reconnaissance mission in South Sudan's Jonglei state has been shot down by the South Sudanese army, killing all four crew members, Reuters is reporting.
The government of Sudan has blamed Israel for a fire at a weapons factory in Khartoum that killed two people.
The fire, which took hours to extinguish, broke out late on Tuesday and caused several large explosions.
Sudan's information minister Ahmed Belal Osman told reporters: "Four military planes attacked the Yarmouk plant ... We believe that Israel is behind it." Israel declined to comment.
Analysts believe arms are smuggled to the Hamas-controlled Gaza strip via Sudan.
A Sudanese military plane crashed in a rural area west of the capital Khartoum on Sunday with 20 armed forces personnel on board and some of them were killed, a military spokesman said.
"Some were killed and some were injured," spokesman Al-Sawarmi Khalid told Reuters. He did not give a precise death toll or the cause of the crash.
A Sudanese minister and 20 other people were killed when the plane they were travelling in crashed, Al Arabiya reports.
The Arabic satellite channel said the plane was carrying Guidance and Endowments Minister Khalil Abdalla, but gave no further details about the incident. There was no immediate official confirmation of the report.