FBI warns of possible terrorist attack in US around Sept 11

Law enforcement officials questioned the reliability of the warning, while government officials who were briefed on it described it as credible and specific enough to warrant attention, said the daily.

Issued Wednesday, the warning said "al-Qaeda leaders plan to employ various types of fuel trucks as vehicle-borne improvised explosive devices in an effort to cause mass casualties in the US prior to the 19th of September," according to law enforcement officials who have read it, the daily said.

It warned that terrorist would seek to hijack gasoline or oxygen tankers or trucks and ram them into a gasoline station to cause major explosions.

AP adds: Islamic militants linked to al-Qaeda have plotted attacks on US and British embassies, hotels, a mall and other targets across the country, according to a confidential Philippines government report reviewed Thursday by The Associated Press.

The report, which was prepared in March, contains sketchy details of bombing, kidnapping and assassination plots that Philippine intelligence agencies say are linked to the Abu Sayyaf extremist group and the separatist Moro Islamic Liberation Front.