The US president said video of crosses on the road was evidence of the scale of attacks on white farmers.
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Tanzanian authorities are not commenting on the allegations, which include sexual assault.
An agreement to hand over the islands from the UK to Mauritius had been expected to be signed on Thursday.
The BBC's Gary O'Donoghue analyses how the South African president reacted in an extraordinary Oval Office meeting.
The BBC's Gary O'Donoghue analyses how the South African president reacted in an extraordinary Oval Office meeting.
The BBC's Gary O'Donoghue analyses how the South African president reacted in an extraordinary Oval Office meeting.
Right-wing Afrikaners groups celebrated the ambush but others in the Rainbow Nation found it "uncomfortable" to watch.
Right-wing Afrikaners groups celebrated the ambush but others in the Rainbow Nation found it "uncomfortable" to watch.
Right-wing Afrikaners groups celebrated the ambush but others in the Rainbow Nation found it "uncomfortable" to watch.
Cyril Ramaphosa rebuts discredited claims of a "white genocide" in South Africa, as US president confronts him in Oval Office.