Seven police officers who were on duty outside parliament have also been suspended over the embarrassing security breach and detained on charges of neglect of duty, police deputy spokeswoman Polly Namaye told AFP.
"The investigators are to test the animals for terrorism related material. You never know, there could have been another motive other than a protest," she said. "This is a standard practice in investigations, leaving out no chances."
Uganda, which has troops in Somalia as part of the African Union force fighting Al-Qaeda-linked Shebab insurgents, is currently on high alert amid fears of attacks by the militants.
This week two men managed to sneak into the tightly guarded parliament and let loose two piglets. The men, Robert Mayanja and Norman Tumuhimbise, are members of a protest movement calling themselves the "jobless brotherhood group".
Officials said the protesters had painted the animals in the colours of the ruling party of President Yoweri Museveni, one of Africa's longest serving leaders, and had written slogans on the animals insulting MPs as corrupt -- including the word "MPigs".
The unemployed men were protesting at what they said was corruption and extravagant spending by lawmakers.
Uganda has been the subject of frequent criticism from foreign donors over allegations of rampant corruption, although protests in the country by Ugandans are rare.
Earlier this year, MPs caused a storm after it emerged they had demanded a massive raise in their salaries, already 60 times higher than most state employees, and that the country's chief auditor had complained deputies had failed to account for millions of dollars of expenses.
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