Sudanese troops have clashed with rebels from Darfur outside the capital, Khartoum, reports say, prompting an overnight curfew in the city.
Sudanese troops have clashed with rebels from Darfur outside the capital, Khartoum, reports say, prompting an overnight curfew in the city.
The rebels announced that their forces had taken nearby Omdurman and were now fighting in the city, but the government said they had been defeated.
The rebels announced that their forces had taken nearby Omdurman and were now fighting in the city, but the government said they had been defeated.
Sudan's army had been preparing for a possible attack on the capital after detecting a heavily-armed rebel column.
Sudan's army had been preparing for a possible attack on the capital after detecting a heavily-armed rebel column.
Correspondents say this is the closest the rebels have ever been to Khartoum.
Correspondents say this is the closest the rebels have ever been to Khartoum.
A curfew has been imposed from 1700 local time (1400 GMT) until 0600 on Sunday, and roads and bridges over the Nile are reported to be closed.
A curfew was imposed in Khartoum from 1700 local time (1400 GMT) until 1000 on Sunday, and roads and bridges over the Nile are reported to be closed.
The BBC's Amber Henshaw, in Khartoum, says the atmosphere in the city is tense.
The US National Security Council spokesman Gordon Johndroe said the White House was very concerned about the fighting.
Chad bases
"We would urge that both sides cease hostilities, whether it is the rebel group or any response from the government. We want to see a calm and order restored."
Army vehicles and an attack helicopter were seen rushing towards the area of the fighting. It was not clear if there were any casualties.
On track
The rebels, from the Justice and Equality Movement (Jem) also claimed to have taken the Wadi Saidna air force base about 10 miles north of Khartoum, although this was unconfirmed.
The rebels, from the Justice and Equality Movement (Jem) claimed to have taken the Wadi Saidna air force base about 10 miles north of Khartoum, Omdurman and to have entered the capital.
"We are now trying to control Khartoum," a Jem spokesman told Reuters news agency. "God willing we will take power, it's just a matter of time.
But Sudan's presidential adviser Gazi Salaheddin told the BBC the rebels had now been defeated except for a few groups.
"We have support from inside Khartoum even from within the armed forces."
Mr Salahddein said JEM had tried to take the capital with the backing of Chad's government. He warned that another contingent of rebel fighters might be on their way across the border.
But a presidential spokesman later told the BBC the rebels had been defeated and the situation was under control.
A JEM spokesman denied these reports and said they were still on track with their plan to overthrow the government.
The BBC's Amber Henshaw, in Khartoum, says the atmosphere in the city is tense but quieter than during the height of the fighting when artillery fire could be heard.
Local people in the area said the fighting had lasted several hours. Some reported power failures and street fighting.
Proxy war
A BBC News website reader in Omdurman said the rebels had cut off access to food supplies.
"The fighting here is terrible," said Chingnachcook. "They are everywhere. I have smuggled out my laptop and I have managed to hide up in our loft."
Asabusaid, in Khartoum said: "Fighter aircraft have been observed taking off from Khartoum and the sound of attack helicopters can be heard in the distance from time to time."
Hashimi, also in Khartoum said: "There are several army men on each street and there is lots of fighting. No one is sticking to the curfew and many are at the mosques."
Experts say Chad and Sudan are fighting a proxy war using each others rebels to achieve their military objectives.
The Jem is one of several rebel groups fighting the government and pro-government Janjaweed militia in the western Darfur region since 2003 over alleged discrimination by the authorities in favour of Arabs.
The Jem is one of several rebel groups fighting the government and pro-government Janjaweed militia in the western Darfur region since 2003 over alleged discrimination by the authorities in favour of Arabs.
The rebels have been involved in raids on government forces in the area before.
The rebels have been involved in raids on government forces in the area before.
An army spokesman said that the rebels had crossed into Sudan from bases in Chad, and had moved through Darfur towards Khartoum.
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Are you in Sudan? Have you been affected by the latest fighting? Send your comments using the form below:
