Sixteen people have been killed and about 400 injured after thousands of people took to the streets in Kenya on Wednesday to protest against the government, Amnesty International Kenya has said.

The marches had been called to mark one year since anti-tax demonstrations that peaked when a huge crowd stormed parliament and dozens were killed by security forces.

At least 60 people were killed in a wave of anti-government protests last year. The authorities have not yet given any casualty figures from Wednesday's protests, but the Kenya Medical Association, Law Society of Kenya and the Police Reforms Working Group said in a joint statement that at least eight protesters were killed.