Two of the 17 American and Canadian Christian missionaries kidnapped in Haiti last month have been released, according to the organization that organized their trip to the Caribbean country on Sunday, without providing any details.

“We have learnt that two of the hostages in Haiti have been released,” said Christian Aid Ministries, based in Ohio.

The 16 Americans and one Canadian, including five children, were kidnapped after visiting an orphanage in October. The episode has brought to light Haiti’s serious kidnapping crisis, which has increased as a result of the country’s economic and political challenges, as well as growing violence.

Haitian officials did not immediately respond to a request for comment. The officials have previously said a gang known as 400 Mawozo was demanding $1 million per person ransom. A man identifying himself as the leader of the gang said in a video posted on YouTube last month that he was willing to kill hostages if he did not get what he wanted.