Ugandan security forces stopped a cell of Somalia's Al-Qaeda linked Shebab insurgents apparently "planning for an imminent attack," the US embassy said today.
Arrests were made, police said, in raids two weeks after Ugandan troops, fighting in Somalia, reportedly provided intelligence that helped US special forces kill the Shebab's chief in a devastating air strike.
"Ugandan authorities reported the discovery of an Al-Shebab terrorist cell in Kampala," the US embassy said in a statement, adding that forces were working to see "whether there are members of the cell still at large."
Citizens were urged to stay at home today.
"We remain in close contact with our Ugandan counterparts as investigations continue into what appears to have been planning for an imminent attack," the US added.
Police spokesman Fred Enanga said forces had "made arrests" but gave no details of how many people had been detained.
"Joint security agencies in Uganda have foiled a terrorist attempt at one of its installations," Enanga told AFP, without giving any further information.
Security forces have boosted patrols around major sites, the US said, in a warning statement to its citizens in the east African nation.
"At this point we are not aware of specific targets, and the Ugandan authorities have increased security at key sites, including Entebbe International Airport," the embassy said.
Last Monday the US embassy warned that Shebab insurgents may try to exact revenge for a US air strike that killed the militant group's commander.
"Stay alert to the ongoing potential for terrorist attacks in Uganda," it said.
"We also caution US citizens of the possibility of retaliatory attacks in Uganda by Al-Shebab in response to the US and Ugandan military actions in Somalia last week which killed Al-Shebab leader Ahmed Godane."
Uganda's government said the country -- a major contributor to AMISOM, the African Union (AU) force fighting the Shebab -- was "happy" at death of Godane, and had provided the US with key intelligence on his whereabouts.
Uganda's Ministry of Internal Affairs said immigration officers had carried out an "operation on illegal immigrant workers in different parts of Kampala" this morning, with 69 people arrested.
It was not clear if the raids were connected.
The Shebab insurgents have claimed recent attacks in Kenya and Djibouti, and at home in Somalia.
