Eleven people were killed in the Sudanese capital of Khartoum on Tuesday, including six members of "state forces," the government's spokesman said on Wednesday, as protesters pushed for an end to President Omar al-Bashir's 30-year rule.

Uniformed personnel from Sudan's National Intelligence and Security Service (NISS) twice tried to disperse thousands of anti-government protesters camped outside the Defense Ministry, the minister said, citing a report by the Khartoum state police chief.

But government soldiers guarding the compound came out both times to protect the demonstrators, firing shots in the air and deploying troops around the area.