A secret US law enforcement report, prepared for the Department of Homeland Security, has warned that Al Qaeda [Images] is planning a 'terror spectacular' this summer.

'This is reminiscent of the warnings and intelligence we were getting in the summer of 2001', the ABC television said on Monday, quoting a senior official with access to the document.

US officials, ABC said, have kept the information secret and Homeland Security Secretary Michael Chertoff told the network that the United States did not have 'have any specific credible evidence that there's an attack focused on the United States at this point'.

Earlier, ABC had reported that US law enforcement officials received intelligence two weeks ago warning of terror attacks in Glasgow and Prague, the Czech Republic, against 'airport infrastructure and aircraft'.

The warnings apparently never reached officials in Scotland, who said they had received 'no advance intelligence' that Glasgow might be a target, ABC said.

Homeland Security Secretary Chertoff declined to comment specifically on the report but told the network that 'everything that we get is shared virtually instantaneously with our counterparts in Britain and vice versa'.

Unlike the United States, officials in Germany [Images] have publicly warned that the country could face a major attack this summer, also comparing the situation to the pre-9/11 summer of 2001, ABC noted.