A Canadian man under investigation in China for threatening national security said he ran a prayer and training facility outside the Chinese city of Dandong that was frequented by North Koreans, many of whom became Christians before returning to the isolated country.

Kevin Garratt, who with his wife, Julia Dawn Garratt, is being investigated for suspected theft of military and intelligence information, also ran a coffee shop in Dandong, which was closed Tuesday with a notice in the window reading: "See you soon."

"When God says to go and do something — yeah we have a choice — but when God's presence says go, we really better go," Garratt said in an audio file posted on the website of Terra Nova Church based in British Columbia, Canada.