An American missionary who was kidnapped in Niger has been released, U.S. officials said Monday.

Jeffery Woodke, a Christian humanitarian aid worker, was released after more than six years in captivity, the White House said.

"I’m gratified & relieved to see the release of U.S. hostage Jeff Woodke after over 6 years in captivity," U.S. national security adviser Jake Sullivan tweeted. "The U.S. thanks Niger for its help in bringing him home to all who miss & love him. I thank so many across our government who’ve worked tirelessly toward securing his freedom."

This is a developing story. Please check back for updates.