US human rights activist Jesse Jackson, who was scheduled to visit Freetown on Monday, has cancelled his visit after checking into hospital, a US embassy spokesman in Abidjan said. Jackson entered hospital in the United States on Friday, the spokesman said, without giving details on his condition. Jackson is the US special envoy for the promotion of democracy in Africa, and was scheduled to visit Freetown to promote the peace process following an accord signed between the government and rebels last July.