Reeva's uncle, Michael Steenkamp, broke down in tears when describing to reporters what a close-knit family she belonged to and how all of her relatives had been due to celebrate Christmas together.
He said that Reeva had spoken about her desire to become an activist fighting abuse against women in the months before her death.
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The country's counter-terrorism forces have regained control of the facility.
The commissioner of the Metropolitan Police has said he cannot promise the public an attack will not take place.
The showers are likely to be particularly heavy across northern parts of the country.