The Sri Lankan Navy detained 37 Chinese fishermen on Sunday night, prompting China to call for their immediate release, reported the China's state news agency, Xinhua.
"The Chinese embassy ... has urged Sri Lankan authorities to handle the issue in accordance with the law, sort out the truth and release the Chinese fishermen as soon as possible," reported Xinhua.
According to Xinhua the fishermen were on board two trawlers by the coast of Batticaloa.
Sri Lanka's Daily Mirror states the trawlers were 13 nautical miles off the coast of the island, and therefore in breach of a China-SL agreement that allows Chinese fishermen to fish beyond 200 nautical miles.