Al Qaeda terrorists are planning attacks against British military bases, a media report quoting a classified British intelligence document said.

There is a "substantial" threat against military bases from international terrorists organisations, said the Sunday Telegraph, which claimed to have obtained the document, entitled "Security Update September 2004".

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Horse Guards Parade, Wellington Barracks, and the Royal Guard Rooms in Buckingham Palace -- all in central
London -- face a "severe" threat, the second highest danger level, it said.

The document, marked "restricted", has been distributed to all military garrisons in Britain, it said. "Credible reporting continues to indicate that Al Qaeda and associated terrorist groups, intend to attack

Western targets globally," the report says, according to the newspaper. "Targeting against UK and US interests both at home and abroad remains a priority for Al Qaeda. The UK remains a high priority for Qaeda planning for terrorist attacks and it will employ a variety of attack methods to breach physical security measures," the document says.

It also warns military service personnel that there is a "real" threat against identifiable servicemen and advises against the wearing of uniform in public "especially in the vicinity of home or while travelling on public transport," the Sunday Telegraph said.