BEIJING (AP) — Chinese state media say two Canadians citizens are under investigation on suspicion of stealing state secrets about China’s military and national defense research.

The official Xinhua News Agency said in a one-paragraph report late Monday that Kevin Garratt and Julia Dawn Garratt were being investigated by the state security bureau in China’s northeastern city of Dandong that borders North Korea. Xinhua does not provide further details. The offense of stealing state secrets is a serious crime in China.

The Canadian newspaper The Globe and Mail says the Garratts are a Vancouver couple who have lived in China since 1984 and have run a popular coffee shop in Dandong since 2008.