WASHINGTON (Reuters) - A videotape televised on Sunday purportedly from a U.S.-member of al Qaeda threatened Los Angeles and Melbourne, Australia, on the fourth anniversary of the September 11 attacks.

ABC News said it had received the video in Pakistan. It reported the masked speaker appears to be Adam Gadahn, from southern California, who threatens attacks on the two cities, "Allah willing," and warns that the attackers will show no compassion.

"Yesterday, London and Madrid. Tomorrow, Los Angeles and Melbourne," he said.

"We love peace, but peace on our terms," the speaker said.

Gadahn was believed to have been the young American who appeared in another threatening tape about year ago.

ABC said the young man apparently converted to Islam at an Orange County, California, mosque as a teen-ager.

Los Angeles Police Chief William Bratton told ABC News his city has "very robust counter terrorism" steps in place and was already on a heightened state of alert because of next month's Jewish holidays.

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