India, Oct. 23 -- US national Mathew VanDyke, who was allowed to return to his home country for a month, returned to India and appeared before a Delhi court on Friday, people familiar with the development said.

The court had directed VanDyke, in an order last month, to appear before it within 72 hours of returning to India, one of the persons said. "He is currently completing formalities in the court," the person said, requesting anonymity.

The six Ukrainian nationals arrested along with VanDyke on March 13, however, have not returned to India.

Last month, a Delhi court allowed VanDyke and the six Ukrainian nationals to return to their respective countries on the condition that they would rejoin the investigation. The seven were arrest...