Live from Abu Dhabi Connect the World takes you on a journey across continents, investigating the stories that are changing our world.
ITN's Bill Neely tweeted that there was "full-scale chaos" as Cameron left a library in Jaffna, with "hundreds of screaming" protesters and police pushing people to the ground.
During Sri Lanka's 28-year civil war, Jaffna, the capital of Northern Province, was a stronghold of the separatist Liberation Tigers of Tamil Eelam and a frequent battleground for clashes with government troops.
Cameron is in Sri Lanka for the Commonwealth Heads of Government Meeting. The summit opened Friday amid concerns about the rights situation after its war with the Tamil rebels, which ended in 2009. The prime ministers of Canada, Mauritius and India opted not to attend.
Cameron issued a statement Thursday saying he saw his attendance as "an opportunity to raise our concerns clearly and directly, and to focus the eyes of the world on Sri Lanka." He also reiterated calls for an investigation into alleged human rights abuses during and after the war.
Max Foster spoke to Bill Neely about what he describes as the "frosty" meeting between Sri Lanka's president and the UK's prime minister.