Kenya has closed its borders with Somalia and Tanzania as the country strives to stem further spread of the coronavirus.

In a televised address to the nation on Saturday, President Uhuru Kenyatta said he was imposing more measures after it emerged that some of the cases had crossed the border from Tanzania and Somalia.

The President also announced that the number of Covid-19 cases in the country had risen to 830 after 49 more people tested positive.

"As of yesterday [Friday], the cases across the border were distributed as follows, Wajir 14, Isebania 10, Namanga 16, Lungalunga 2 and Loitoktok 1," Kenyatta said, referring to border towns near Tanzania.

Tanzania later claimed the meeting was for the Northern Corridor, a reference to countries that mainly import goods through Kenya's Port of Mombasa.