The United Nations' human rights chief has accused Britain's tabloid newspapers of hate speech against immigrants.

Zeid Raad al-Hussein, the U.N. high commissioner for human rights, said Friday that an article in The Sun comparing migrants to cockroaches used language similar to that employed by the instigators of Rwanda's 1994 genocide.

The April 17 column by Katie Hopkins, a former contestant on TV show "The Apprentice," has caused controversy in Britain. Hopkins said gunboats should be used against migrant boats in the Mediterranean, and called immigrants "feral humans."

Zeid said the column "was simply one of the more extreme examples of thousands of anti-foreigner articles that have appeared in U.K. tabloids over the past two decades."

He urged British media, authorities and regulators to curb incitement to hatred.