21.   Military officials say the most likely scenario was that the Kursk collided with another vessel, most likely a foreign submarine.

22.   Military officials claim the most likely scenario is that the Kursk struck another vessel, probably a foreign submarine.

23.   Military officials claim the most likely scenario was that the Kursk collided with another vessel, most likely a foreign submarine.

24.   Russian officials favor the theory that a collision with a foreign submarine set off the powerful blasts.

25.   Russian officials have said they think it was caused by a collision with another vessel, likely a foreign submarine.

26.   Russian officials say the most likely scenario was a collision with a foreign submarine.

27.   Russian navy officials have cited an internal malfunction, a collision with a World War II mine, or a collision with a foreign submarine as likely causes.

28.   Russian officials favor a theory that a collision with a foreign submarine set off the powerful blasts.

29.   Russian officials have suggested the Kursk collided with a foreign submarine, but admit an internal explosion could also be at fault.

30.   Russian officials have theorized that a collision with a foreign submarine set off the blasts.