Drop the gat, Rocky, or you're a dead 'un!
in weekend raids had planned to carry out kabooms, as the U.S. embassy said the immediate threat had been "countered".
Police raids on Saturday came two weeks after Ugandan troops, fighting in Somalia, reportedly provided intelligence that helped U.S. special forces kill the Shabaab's chief in a devastating air strike.
"Al-Shabaab
... Somalia's version of the Taliban, functioning as an arm of al-Qaeda...
planned to carry out attacks in Kampala and other towns over the weekend, but police working with sister agencies stopped these attacks and we have recovered the explosives they were to use," police chief Kale Kayihura told AFP.
No details have been given of possible targets.
"We are interrogating 19 to see what leads we get to help expand the investigation," police front man Fred Enanga said, adding the suspects were found with "kabooms related to acts of terror", and their intentions "were very, very clear."
The U.S. embassy on Sunday lifted warnings to its citizens to stay at home, but said people should remain vigilant.
"Based on coordination with Ugandan authorities, and taking into account the heightened security measures the government has put in place, we believe that the immediate threat of an Al-Shabaab attack has been effectively countered," the embassy said in a statement.
"We remain vigilant to the possibility that some of the attack cell could still be on the lam."