Live: Latest on Sudan crackdown

The death toll from this morning's attack on the sit-in has risen to 13, including an eight-year-old child, according to the Sudanese Doctors' Committee.

The protester-aligned group said it has confirmed 116 injuries at various hospitals in Khartoum and the number is rising. 

According to their numbers, more than 100 Sudanese protesters have been killed since the sit-in outside the military headquarters began on 6 April. 

The opposition announced they have cut all contact with the military council, who negotiations with had stalled for more than a week before this morning's attack.

"We announce the end of all political contact and negotiations with the putschist Council," the Forces for Freedom and Change, the umbrella group for protesters and opposition, said in a statement. 

The military has denied that it dispersed the sit-in, claiming it was trying to clear a nearby area where there were already several clashes last week. 

"The protest camp has not been dispersed," military council spokesman Shamseddine Kabbashi said. "The security forces were trying to disperse unruly (elements) in the Colombia area, near the protest site, and some of these elements fled to the protest site and caused this chaos."

Hospitals in Khartoum have been besieged by Sudanese forces, the protest-linked Sudanese Doctors' Committee said. 

It said the Royal Care hospital, which has often taken casualties from the protest, has been besieged and volunteers are being prevented from going to the hospital. 

A doctor told MEE they could not reach the hospital to help. 

"If they know I'm a doctor, they will arrest me," they said. 

Journalists have also reported that they have been barred from going on to the street to cover the aftermath of this morning's attack. 

Protest leaders have called for a campaign of civil disobedience around Sudan to respond to the attack on the sit-in. 

The opposition Sudanese Professionals Association called for protesters in every city to "block all streets and bridges" as a message to the ruling military council. 

"We call for a campaign of comprehensive civil disobedience to bring down the treacherous, murderous military council and complete our revolution."

Sudanese forces raided the site of a two-month sit-in for civilian rule this morning, firing on the protesters and killing at least nine of them according to doctors. 

It's the deadliest violence against protesters since three-decade ruler Omar al-Bashir was ousted on 11 April and comes as negotiations between the protesters and ruling military council have stalled. 

Protesters accuse the military of trying to break the sit-in but many have remained and are building new barricades around the site in response to the attack.