BAGHDAD - U.S. and Iraqi officials chased reports Tuesday that the leader of al-Qaida in Iraq was killed by rivals north of Baghdad. But U.S. authorities urged caution and warned that even if the claim were true, the death of the shadowy Abu Ayyub al-Masri would likely not spell the end of the terror movement in Iraq.

Reports of al-Masri’s death first emerged from the Interior Ministry, which said the al-Qaida leader was gunned down by rivals in his movement Tuesday at a bridge near Lake Tharthar just north of Baghdad, where the U.S. military believes al-Qaida operates training camps.

Later, however, ministry spokesman Brig. Gen. Abdul-Karim Khalaf said al-Masri’s death had not been confirmed. Another senior official, Maj. Gen. Hussein Kamal, told The Associated Press that “we are trying to investigate and confirm the report.”

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