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Four children - a girl and three boys - have been "brutally stabbed and killed" at a school in the Ugandan capital, Kampala, the police have said.

A 34-year-old suspect has been detained but "the motive behind the killings is still under investigation", Uganda's police force added in a brief statement on X.

The school has been named as the Ggaba Early Childhood Development Program School in the capital's Makindye Division.

Investigators are at the scene and a police spokesperson said that more details would be provided later. Police chief Abas Byakagaba and other senior officers have also been at the school and been briefed on what had happened.

Byakagaba urged the public to remain calm while the police continue to do their work.

Uganda's Daily Monitor newspaper is quoting local residents as saying that the suspect posed as a parent to get into the school and then after talking to the administrator attacked the children. The victims were between the ages of two and three, the newspaper adds.

The tragic incident has sent shock waves across the country, raising serious concerns about the safety of learners in the East African nation.

Videos of the aftermath being shared on social media show images of crowds of angry and distressed people.

The suspect was quickly apprehended to "prevent him from being lynched", local journalist Erich Mboowa has reported on X.