Foreign Secretary William Hague has expressed his concern over UK journalists being blocked from going to north Sri Lanka by protesters.
A team from Channel 4 News were escorted away by police after a group of people blocked their train.
Channel 4 News editor Ben de Pear tweeted: "It seems it is mob rule in Sri Lanka, albeit orchestrated by the authorities to prevent free press access to the north of Sri Lanka.
"We have left the train in order for the hundreds of other people on it to continue their journey north."
Mr Hague also tweeted: "We have repeatedly pressed for media freedom throughout Sri Lanka especially CHOGM (Commonwealth Heads of Government Meeting). Urge government to let journalists report as promised."
Channel 4 previously broadcast three documentaries which examined the alleged war crime by both the government and Tamil Tigers in Sri Lanka.