Khartoum - Sudan's security services thwarted a "sabotage attempt" led by opposition forces and arrested a number of civilian and military figures in connection with the incident early on Thursday morning, state-linked media reported.
Witnesses told Reuters they saw tanks and armoured vehicles moving down a major street in central Khartoum, the capital, around midnight. A Reuters reporter said security in the area appeared normal early in the morning.
Sudan's security and intelligence agency "foiled a sabotage plot this morning aimed at bringing about security disturbances in the country led by figures from the opposition forces," the Sudanese Media Centre (SMC) reported.
Quoting a security source, SMC said authorities had arrested "military and civilian figures" in connection with the plot. It did not identify them.
Officials could not immediately be reached for comment on the report. SMC earlier reported in a text message to mobile phones that the security and intelligence services had "frustrated a sabotage attempt".
Witnesses said they had seen military vehicles in a main street in central Khartoum during the night.
"We saw something unusual in Khartoum before midnight yesterday. Four armoured vehicles and two tanks on Abeid Khatim street heading in the direction of downtown," one witness said, asking not to be named.
Security at the defence ministry, intelligence headquarters and other buildings associated with military and security authorities appeared normal early in the morning, a Reuters witness said.