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WASHINGTON, May 27 (Reuters) - Groups that monitor Islamic Web sites say al Qaeda will post a new video in the next 24 hours urging jihadists to use biological, chemical and nuclear weapons to attack the West, the FBI said on Tuesday.

Spokesman Richard Kolko said FBI sent out an alert to U.S. law enforcement agencies about the expected video.

"We got information the tape is coming," said Kolko. "We sent out an alert to law enforcement (agencies) to let them know the tape was coming."

Kolko said the alert was a routine precaution sent to 1,800 U.S. law enforcement agencies.

According to an ABC News report, the FBI bulletin said there is no evidence of any direct threat.

Kolko said the information about the al Qaeda call to jihadists was gleaned from organizations that monitor Islamic militant Web sites.

Osama bin Laden and al Qaeda are linked to the Sept. 11 attacks in New York and Washington that killed around 3,000 people, the Oct. 12, 2002 attack when 202 people died in blasts on the tourist island of Bali. (Reporting by Joanne Allen; Writing by Philip Barbara)