Two American journalists, Laura Ling and Euna Lee, were arrested after entering North Korea in 2009.

CNN: STORY HIGHLIGHTS

In a letter Laura Ling sent to her family, she asked them to remain strong.

CNN: Families lobby media before journalists' North Korean trial

In one of the most high-profile cases, Mr Clinton negotiated the release in 2009 of two US journalists, Laura Ling and Euna Lee, who had been found guilty of entering North Korea illegally.

BBC: North Korea to issue verdict on US citizen