Rwanda has reported 72 cases in police detention centres among daily new infections that pushed the total number of cases over 1,000.
This is the first time coronavirus cases have been reported in prisons in Rwanda.
Health officials said the cases were connected to new infections detected in the east of the country.
Last week, Rwandan authorities re-introduced a two-week lockdown in parts of the capital, Kigali, as dozens of cases were confirmed.
Nearly half of all the Covid-19 cases in Rwanda were reported this month.
Most cases were recorded in the east, near the border with Tanzania, and in the south-west near the border with the Democratic Republic of Congo.
Mass testing has been taking place in the last two weeks.
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