Four days before the Christmas Day attempt to blow up a Northwest Airlines flight, an Al-Qaida operative in Yemen posted an online video threatening the United States.

In the video, a man representing al-Qaida delivered a eulogy for militants killed in a Yemeni airstrike on a militant training camp four days earlier.

The speaker said he had no agenda against Yemeni soldiers, but warned them against cooperating with Americans.

The video does not contain any clear evidence that the speaker was anticipating Friday's attempt, but it has attracted scrutiny because of reports, that the bombing plot may have originated in Yemen.

The 23-year-old Nigerian man accused in the attack claims he received training from al-Qaida operatives there. Also, a key American lawmaker also said there were "strong suggestions" of a Yemeni connection.