Two of the four victims were shot dead in Khartoum and the neighboring city of Omdurman, while the other two were stabbed with a sharp machine and died at Omdurman hospital, according to Sudan's Central Doctors Committee.
The death toll from the bloody crackdown on protesters on June 3 rose to 118, the commission said.
According to al-Bawaba site, the capital Khartoum looks like a ghost town, with its streets largely empty. At the beginning of the Sudan Labor Week on Sunday morning, few people and vehicles were seen in the streets.
Public transport was barely functioning, as most commercial banks, private companies and markets closed, while some state banks and public utility offices were opened normally.
At Khartoum airport, where very few trips took off, travelers gathered at the terminal and most travel offices closed at the airport with the Internet down, and ticket prices rose exponentially.
The Union of Sudanese Professionals declared that the Military Council had closed government and private hospitals, creating a catastrophic situation that posed a direct threat to the lives of the sick and injured.