The US Embassy in Khartoum urged Americans to ``shelter in place'' and ``remain aware of their surroundings'' hours after Sudan's top general declared a state of emergency and dissolved the civilian government.

Internet remained widely disrupted across the country and the embassy noted it was ``non-functional'' in Khartoum.

It asked that American citizens not travel to the US Embassy or to international airports in Khartoum or Port Sudan, where it said outbound flights were halted.

Monday's apparent takeover came after weeks of rising tensions between Sudan's civilian and military leaders. 

A failed coup attempt in September fractured the country along old lines, pitting more conservative Islamists who want a military government against those who toppled al-Bashir in protests. 

In recent days, both camps have taken to the street in demonstrations.