Japan said Thursday it was investigating the reported kidnapping of a Japanese journalist in Syria by an armed group, after two of its citizens were beheaded earlier this year, AFP reports.

Media rights group Reporters Without Borders said Jumpei Yasuda, a freelance journalist, was kidnapped in July as he was crossing the border into the country and is still being held hostage by the group, which was not named.

Chief Cabinet Secretary Yoshihide Suga declined to directly confirm the report when asked about it at a regular media briefing, but stressed the government was obligated to ensure the safety of Japanese citizens.