国际英语新闻:FBI says IS executioner in beheading videos identified: report

WASHINGTON, Sept. 25 (Xinhua) -- U.S. Federal Bureau of Investigation (FBI) believes that it has identified the masked Islamic State (IS) militant who has been videotaped beheading Western hostages, FBI Director James Comey said on Thursday.

But Comey declined to reveal the man's name or nationality, local media ABC News reported.

The masked, black clad militant, with a British accent, killed two American journalists, James Foley and Steven Sotloff, and a British aid worker, David Haines, in videos released by the terrorist group that has controlled large swaths of Syria and Iraq.

In the three clips, the suspect holds a long knife and appears to begin cutting the captives. The militant -- who speaks with a southern English accent -- shows only his eyes in all three videos.

From the footage, the executioner appears to be left-handed and of average height and build.

The FBI director also said that more than 100 Americans in total had either managed to reach Syria, had been arrested while trying to travel there, or had gone and returned, the report said.

Comey indicated that terrorists in Syria may still be plotting attacks on the West, and there was no sign yet that U.S. airstrikes this week had disrupted the group's plans.