North Korea has arrested several US citizens in recent years, including journalists and Christians accused of proselytism.

BBC: North Korea to issue verdict on US citizen

It aims to achieve that by various means and strategies, including proselytism, infiltration of our institutions, taking over Muslim institutions, creating parallel societies and enforcing shariah in Muslim communities, but also intimidation and terrorism.

CENTERFORSECURITYPOLICY: Seven years since 9/11

After joining Tablighi Jamaat groups at a local mosque or Islamic center and doing a few local dawa (proselytism) missions, Tablighi officials invite star recruits to the Tablighi center in Raiwind, Pakistan, for four months of additional missionary training.

CENTERFORSECURITYPOLICY: Tablighi Jamaat: Jihad's stealthy legions